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【单选题】
关于酶活性中心的错误说法是
A.
活性中心可处在一条多肽链上
B.
活性中心可跨越在两条多肽链上
C.
活性中心就是酶的催化基团和结合基团集中形成具有一定空间结构的区域
D.
酶的必需基团就是酶的活性中心
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参考答案：
举一反三
【单选题】Esophageal carcinoma is the most common tumor of the esophagus.
A.
恶性肿瘤
B.
支气管肺癌
C.
肝囊肿
D.
食道癌
查看完整题目与答案
【单选题】A 43-year-old man has complained of mild burning substernal pain following meals for the past 3 years. Upper GI endoscopy is performed and biopsies are taken of an erythematous area of the lower esoph...
A.
Dysplasia
B.
Hyperplasia
C.
Carcinoma
D.
Ischemia
E.
Metaplasia
查看完整题目与答案
【单选题】A 68-year-old man from Birmingham, England, has had "heartburn"and substernal pain after meals for 25 years. For the past vear, he has had increased pain with difficulty swal- lowing both liquids and ...
A.
Adenocarcinoma
B.
Carcinoid tumor
C.
Leiomyosarcoma
D.
Non-Hodgkin lymphoma
E.
Squamous cell carcinoma
查看完整题目与答案
【单选题】Pentium 4微处理器在实模式下访问存储器时，段寄存器提供的是
A.
段选择子
B.
段基址
C.
段描述符
D.
偏移地址
查看完整题目与答案
【单选题】Which type does this picture of esophageal carcinoma present grossly?【图片】
A.
ulcerative type
B.
polypoid exophytic type
C.
diffuse infiltrative type
D.
narrowing  type
查看完整题目与答案
【单选题】A 68-year-old man from Birmingham, England, has had “heartburn” and substernal pain after meals for 25 years. For the past year, he has had increased pain with difficulty swallowing both liquids and s...
A.
Adenocarcinoma
B.
Carcinoid tumor
C.
Leiomyosarcoma
D.
Non-Hodgkin lymphoma
E.
Squamous cell carcinoma
查看完整题目与答案
【单选题】A 60-year-old man presents with a 5-week history of difficulty swallowing. Physical examination is unremarkable. Upper endoscopy shows a large mass in the upper third of the esophagus. A biopsy is sho...
A.
Adenocarcinoma
B.
Glandular metaplasia
C.
Malignant melanoma
D.
Squamous cell carcinoma
E.
Transitional cell carcinoma
查看完整题目与答案
【单选题】A 68-year-old woman has had substernal pain after meals for many years. For the past year, she has had increased difficulty swallowing liquids and solids. On physical examination, there are no remarka...
A.
Adenocarcinoma
B.
Leiomyosarcoma
C.
Squamous cell carcinoma
D.
Non-Hodgkin lymphoma
E.
Carcinoid tumor
查看完整题目与答案
【单选题】世界近代史上,最早通过条约形式划分世界势力范围的国家是()
A.
英国和法国
B.
英国和意大利
C.
西班牙和葡萄牙
D.
美国和英国
查看完整题目与答案
【单选题】Esophageal carcinoma arises mostly in
A.
the lower part of esophagus.
B.
the middle third of esophagus.
C.
the upper part of esophagus.
D.
the esophageal-gastric junction.
查看完整题目与答案
相关题目：
【单选题】Esophageal carcinoma is the most common tumor of the esophagus.
A.
恶性肿瘤
B.
支气管肺癌
C.
肝囊肿
D.
食道癌
查看完整题目与答案
【单选题】A 43-year-old man has complained of mild burning substernal pain following meals for the past 3 years. Upper GI endoscopy is performed and biopsies are taken of an erythematous area of the lower esoph...
A.
Dysplasia
B.
Hyperplasia
C.
Carcinoma
D.
Ischemia
E.
Metaplasia
查看完整题目与答案
【单选题】A 68-year-old man from Birmingham, England, has had "heartburn"and substernal pain after meals for 25 years. For the past vear, he has had increased pain with difficulty swal- lowing both liquids and ...
A.
Adenocarcinoma
B.
Carcinoid tumor
C.
Leiomyosarcoma
D.
Non-Hodgkin lymphoma
E.
Squamous cell carcinoma
查看完整题目与答案
【单选题】Pentium 4微处理器在实模式下访问存储器时，段寄存器提供的是
A.
段选择子
B.
段基址
C.
段描述符
D.
偏移地址
查看完整题目与答案
【单选题】Which type does this picture of esophageal carcinoma present grossly?【图片】
A.
ulcerative type
B.
polypoid exophytic type
C.
diffuse infiltrative type
D.
narrowing  type
查看完整题目与答案
【单选题】A 68-year-old man from Birmingham, England, has had “heartburn” and substernal pain after meals for 25 years. For the past year, he has had increased pain with difficulty swallowing both liquids and s...
A.
Adenocarcinoma
B.
Carcinoid tumor
C.
Leiomyosarcoma
D.
Non-Hodgkin lymphoma
E.
Squamous cell carcinoma
查看完整题目与答案
【单选题】A 60-year-old man presents with a 5-week history of difficulty swallowing. Physical examination is unremarkable. Upper endoscopy shows a large mass in the upper third of the esophagus. A biopsy is sho...
A.
Adenocarcinoma
B.
Glandular metaplasia
C.
Malignant melanoma
D.
Squamous cell carcinoma
E.
Transitional cell carcinoma
查看完整题目与答案
【单选题】A 68-year-old woman has had substernal pain after meals for many years. For the past year, she has had increased difficulty swallowing liquids and solids. On physical examination, there are no remarka...
A.
Adenocarcinoma
B.
Leiomyosarcoma
C.
Squamous cell carcinoma
D.
Non-Hodgkin lymphoma
E.
Carcinoid tumor
查看完整题目与答案
【单选题】世界近代史上,最早通过条约形式划分世界势力范围的国家是()
A.
英国和法国
B.
英国和意大利
C.
西班牙和葡萄牙
D.
美国和英国
查看完整题目与答案
【单选题】Esophageal carcinoma arises mostly in
A.
the lower part of esophagus.
B.
the middle third of esophagus.
C.
the upper part of esophagus.
D.
the esophageal-gastric junction.
查看完整题目与答案
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