6r1r

RIBONUCLEOTIDE REDUCTASE E441D MUTANT R1 PROTEIN FROM ESCHERICHIA COLI

Method: X-RAY DIFFRACTION Dmax: 165.8 Å Quality: GOOD

1. 蛋白身份与相关结构 Protein Identity & Related Structures

RIBONUCLEOTIDE REDUCTASE R1 PROTEIN

Escherichia coli

UniProt P00452

当前结构中的状态

Assembly 聚集状态 构建体 突变与修饰 配体、离子与共同组分 实验方法与环境 结构质量
1 蛋白异源复合物 异源复合物 蛋白 × 3 PDB 声明:trimeric(3) 与蛋白拷贝数一致 链 A; UniProt 1–761 突变:E441D RIBONUCLEOTIDE REDUCTASE R2 PROTEIN × 2 (P69924) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
2 蛋白异源复合物 异源复合物 蛋白 × 2 PDB 声明:dimeric(2) 与蛋白拷贝数一致 链 B; UniProt 1–761 突变:E441D RIBONUCLEOTIDE REDUCTASE R2 PROTEIN × 1 (P69924) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
3 蛋白异源复合物 异源复合物 蛋白 × 2 PDB 声明:dimeric(2) 与蛋白拷贝数一致 链 C; UniProt 1–761 突变:E441D RIBONUCLEOTIDE REDUCTASE R2 PROTEIN × 1 (P69924) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
4 蛋白异源复合物 异源复合物 蛋白 × 12 PDB 声明:dodecameric(12) 与蛋白拷贝数一致 链 A; UniProt 1–761 链 B; UniProt 1–761 突变:E441D RIBONUCLEOTIDE REDUCTASE R2 PROTEIN × 6 (P69924) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
5 蛋白异源复合物 异源复合物 蛋白 × 12 PDB 声明:dodecameric(12) 与蛋白拷贝数一致 链 C; UniProt 1–761 突变:E441D RIBONUCLEOTIDE REDUCTASE R2 PROTEIN × 6 (P69924) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
6 蛋白同源多聚体 同源多聚体 蛋白 × 6 PDB 声明:hexameric(6) 与蛋白拷贝数一致 链 A; UniProt 1–761 链 B; UniProt 1–761 突变:E441D 无其他共同聚合物 X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
7 蛋白异源复合物 异源复合物 蛋白 × 4 PDB 声明:tetrameric(4) 与蛋白拷贝数一致 链 A; UniProt 1–761 链 B; UniProt 1–761 突变:E441D RIBONUCLEOTIDE REDUCTASE R2 PROTEIN × 2 (P69924) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
8 蛋白异源复合物 异源复合物 蛋白 × 4 PDB 声明:tetrameric(4) 与蛋白拷贝数一致 链 C; UniProt 1–761 突变:E441D RIBONUCLEOTIDE REDUCTASE R2 PROTEIN × 2 (P69924) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
9 蛋白异源复合物 异源复合物 蛋白 × 2 PDB 声明:dimeric(2) 与蛋白拷贝数一致 链 A; UniProt 1–761 突变:E441D RIBONUCLEOTIDE REDUCTASE R2 PROTEIN × 1 (P69924) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240

数据库中的同蛋白其他状态

以下每一行都是同一 UniProt 蛋白在另一个 PDB 条目中的 biological assembly, “相对当前条目”直接指出证据层面的不同;没有差异标签表示当前已读取字段一致。

共 33 个其他 PDB 条目、96 个 assembly。 打开独立比较页并筛选聚集状态

查看构建体与数据证据
UniProt名称 RIR1_ECOLI
Isoform
PDB实体 1
链与序列区间 作者链 A; PDB构建体 1–761; UniProt 1–761 作者链 B; PDB构建体 1–761; UniProt 1–761 作者链 C; PDB构建体 1–761; UniProt 1–761

RIBONUCLEOTIDE REDUCTASE R2 PROTEIN

Escherichia coli

UniProt P69924

当前结构中的状态

Assembly 聚集状态 构建体 突变与修饰 配体、离子与共同组分 实验方法与环境 结构质量
1 蛋白异源复合物 异源复合物 蛋白 × 3 PDB 声明:trimeric(3) 与蛋白拷贝数一致 链 D; UniProt 356–375 链 P; UniProt 356–375 片段:C-TERMINAL PORTION, 20 RESIDUES RIBONUCLEOTIDE REDUCTASE R1 PROTEIN × 1 (P00452) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
2 蛋白异源复合物 异源复合物 蛋白 × 2 PDB 声明:dimeric(2) 与蛋白拷贝数一致 链 E; UniProt 356–375 片段:C-TERMINAL PORTION, 20 RESIDUES RIBONUCLEOTIDE REDUCTASE R1 PROTEIN × 1 (P00452) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
3 蛋白异源复合物 异源复合物 蛋白 × 2 PDB 声明:dimeric(2) 与蛋白拷贝数一致 链 F; UniProt 356–375 片段:C-TERMINAL PORTION, 20 RESIDUES RIBONUCLEOTIDE REDUCTASE R1 PROTEIN × 1 (P00452) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
4 蛋白异源复合物 异源复合物 蛋白 × 12 PDB 声明:dodecameric(12) 与蛋白拷贝数一致 链 D; UniProt 356–375 链 E; UniProt 356–375 片段:C-TERMINAL PORTION, 20 RESIDUES RIBONUCLEOTIDE REDUCTASE R1 PROTEIN × 6 (P00452) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
5 蛋白异源复合物 异源复合物 蛋白 × 12 PDB 声明:dodecameric(12) 与蛋白拷贝数一致 链 F; UniProt 356–375 片段:C-TERMINAL PORTION, 20 RESIDUES RIBONUCLEOTIDE REDUCTASE R1 PROTEIN × 6 (P00452) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
7 蛋白异源复合物 异源复合物 蛋白 × 4 PDB 声明:tetrameric(4) 与蛋白拷贝数一致 链 D; UniProt 356–375 链 E; UniProt 356–375 片段:C-TERMINAL PORTION, 20 RESIDUES RIBONUCLEOTIDE REDUCTASE R1 PROTEIN × 2 (P00452) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
8 蛋白异源复合物 异源复合物 蛋白 × 4 PDB 声明:tetrameric(4) 与蛋白拷贝数一致 链 F; UniProt 356–375 片段:C-TERMINAL PORTION, 20 RESIDUES RIBONUCLEOTIDE REDUCTASE R1 PROTEIN × 2 (P00452) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240
9 蛋白异源复合物 异源复合物 蛋白 × 2 PDB 声明:dimeric(2) 与蛋白拷贝数一致 链 D; UniProt 356–375 片段:C-TERMINAL PORTION, 20 RESIDUES RIBONUCLEOTIDE REDUCTASE R1 PROTEIN × 1 (P00452) X-RAY DIFFRACTION X-ray结晶条件:pH 6;PROTEIN WAS CRYSTALLIZED FROM 1.7 M LITHIUM SULFATE, AND 10 MM MAGNESIUM SULFATE IN 25 MM CITRATE BUFFER AT PH 6.0 THE PROTEIN SOLUTION CONTAINED 17 MG/ML R1 PROTEIN, 20 FOLD EXCESS OF A 20-RESIDUE PEPTIDE CORRESPONDING TO THE C-TERMINUS OF THE R2 SUBUNIT AND IS ESSENTIAL FOR CRYSTALLIZATION 分辨率 3.10 Å R-free 0.240

数据库中的同蛋白其他状态

以下每一行都是同一 UniProt 蛋白在另一个 PDB 条目中的 biological assembly, “相对当前条目”直接指出证据层面的不同;没有差异标签表示当前已读取字段一致。

共 62 个其他 PDB 条目、119 个 assembly。 打开独立比较页并筛选聚集状态

查看构建体与数据证据
UniProt名称 RIR2_ECOLI
Isoform
PDB实体 2
链与序列区间 作者链 D; PDB构建体 1–20; UniProt 356–375 作者链 E; PDB构建体 1–20; UniProt 356–375 作者链 F; PDB构建体 1–20; UniProt 356–375 作者链 P; PDB构建体 1–20; UniProt 356–375

页面优先展示蛋白身份、当前 assembly、共同组分、聚集状态和跨 PDB 结构链接。 链映射与序列区间收在“数据证据”中;数据库内部编号、导入时间和 assembly 操作表达式仅用于维护,因此不在读者页面展示。

SAXS 散射曲线 SAXS Profile

SAXS profile for 6r1r

P(r) 距离分布 P(r) Distribution

P(r) distribution for 6r1r
下载 Download

2. 结构基本信息 2. Structure Basics

条目编号 entry_id6r1r
沉积日期 deposition_date1997-09-17
结构标题 titleRIBONUCLEOTIDE REDUCTASE E441D MUTANT R1 PROTEIN FROM ESCHERICHIA COLI
关键词 keywords;RIBONUCLEOTIDE REDUCTASE, DEOXYRIBONUCLEOTIDE SYNTHESIS, RADICAL CHEMISTRY, ALLOSTERIC REGULATION, SPECIFICITY, COMPLEX (OXIDOREDUCTASE-PEPTIDE), COMPLEX (OXIDOREDUCTASE-PEPTIDE) complex ;; COMPLEX (OXIDOREDUCTASE/PEPTIDE)
实验方法 methodX-RAY DIFFRACTION

3. SAXS 参数 (CRYSOL 理论计算) 3. SAXS Parameters (CRYSOL)

回转半径 Rg (Guinier) rg_guinier49.90
回转半径 Rg (电子) rg_electron49.57
零角强度 I(0) i0941839000.00
分子量 molecular_weight256440.0 kDa
排除体积 excluded_volume320950 ų
包络体积 envelope_volume437480 ų
水化壳体积 shell_volume71928 ų
包络直径 envelope_diameter166.1
壳层 Rg shell_rg55.19
包络 Rg envelope_rg48.54
形状 Rg shape_rg49.59
总 Rg total_rg49.70
总原子数 total_atoms18073
残基数 n_residues2272
球谐函数阶数 n_harmonics20
q 范围 q_range— – 0.5000 −1
数据点数 n_points101
壳层类型 shell_typedirectional
溶剂电子密度 solvent_density0.3340 e/ų
壳层衬度 contrast_shell0.0300 e/ų
CRYSOL 版本 crysol_version4.1.3

4. P(r) 距离分布 (GNOM 反演) 4. P(r) Analysis (GNOM)

最大尺寸 Dmax dmax165.8
Rg (实空间) rg_real49.83
Rg 误差 (实空间) rg_real_error1.47
I(0) (实空间) i0_real9.4180e+08
I(0) 误差 (实空间) i0_real_error1.7570e+07
Rg (倒空间) rg_reciprocal49.90
I(0) (倒空间) i0_reciprocal941900000.0000
解质量估计 total_estimate0.8890
解质量评级 solution_quality GOOD a GOOD solution
P(r) 峰数 n_peaks2
主峰位置 r_peak_primary72.5
偏度 Skewness skewness0.149
峰度 Kurtosis kurtosis-0.746
角度范围 angular_range— – 0.1600 −1
当前正则化参数 α current_alpha0.0000
最高正则化参数 α highest_alpha108700000.0000
实空间数据点数 n_real_points33
GNOM 版本 gnom_version4.1.3
质量判据 quality_criteria AN1: 0.000; Oscil: 0.884; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.979; Smooth: 0.922

5. 晶体学与实验 5. Crystallography & Experiment

6. 实体与聚合物信息 Entities & Polymers (3)

7. 折叠分类 (SCOP + CATH) 9 domains

SCOP 2.08 (6 domains)

结构域编号 domain_idd6r1ra1
类 Class classa — All alpha proteins
折叠类型 Fold folda.98 — R1 subunit of ribonucleotide reductase, N-terminal domain
超家族 Superfamily superfamilya.98.1 — R1 subunit of ribonucleotide reductase, N-terminal domain
家族 Family familya.98.1.1 — R1 subunit of ribonucleotide reductase, N-terminal domain
结构域编号 domain_idd6r1ra2
类 Class classc — Alpha and beta proteins (a/b)
折叠类型 Fold foldc.7 — PFL-like glycyl radical enzymes
超家族 Superfamily superfamilyc.7.1 — PFL-like glycyl radical enzymes
家族 Family familyc.7.1.2 — R1 subunit of ribonucleotide reductase, C-terminal domain
结构域编号 domain_idd6r1rb1
类 Class classa — All alpha proteins
折叠类型 Fold folda.98 — R1 subunit of ribonucleotide reductase, N-terminal domain
超家族 Superfamily superfamilya.98.1 — R1 subunit of ribonucleotide reductase, N-terminal domain
家族 Family familya.98.1.1 — R1 subunit of ribonucleotide reductase, N-terminal domain
结构域编号 domain_idd6r1rb2
类 Class classc — Alpha and beta proteins (a/b)
折叠类型 Fold foldc.7 — PFL-like glycyl radical enzymes
超家族 Superfamily superfamilyc.7.1 — PFL-like glycyl radical enzymes
家族 Family familyc.7.1.2 — R1 subunit of ribonucleotide reductase, C-terminal domain
结构域编号 domain_idd6r1rc1
类 Class classa — All alpha proteins
折叠类型 Fold folda.98 — R1 subunit of ribonucleotide reductase, N-terminal domain
超家族 Superfamily superfamilya.98.1 — R1 subunit of ribonucleotide reductase, N-terminal domain
家族 Family familya.98.1.1 — R1 subunit of ribonucleotide reductase, N-terminal domain
结构域编号 domain_idd6r1rc2
类 Class classc — Alpha and beta proteins (a/b)
折叠类型 Fold foldc.7 — PFL-like glycyl radical enzymes
超家族 Superfamily superfamilyc.7.1 — PFL-like glycyl radical enzymes
家族 Family familyc.7.1.2 — R1 subunit of ribonucleotide reductase, C-terminal domain

CATH v4.4 (3 domains)

结构域编号 domain_id6r1rA02
类 Class class3 — Alpha Beta
架构 Architecture architecture20 — Alpha-Beta Barrel
拓扑 Topology topology70 — Anaerobic Ribonucleotide-triphosphate Reductase Large Chain
同源超家族 H-superfamily homologous superfamily20
结构域编号 domain_id6r1rB02
类 Class class3 — Alpha Beta
架构 Architecture architecture20 — Alpha-Beta Barrel
拓扑 Topology topology70 — Anaerobic Ribonucleotide-triphosphate Reductase Large Chain
同源超家族 H-superfamily homologous superfamily20
结构域编号 domain_id6r1rC02
类 Class class3 — Alpha Beta
架构 Architecture architecture20 — Alpha-Beta Barrel
拓扑 Topology topology70 — Anaerobic Ribonucleotide-triphosphate Reductase Large Chain
同源超家族 H-superfamily homologous superfamily20

8. 引用文献 (3)

9. 文件与曲线 (10)