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【单选题】
下列对主关键字段的叙述,错误的是()。
A.
数据库中的每个表都必须有一个主关键字段
B.
主关键字唯一的
C.
主关键字可以是一个字段,也可以是一组字段
D.
主关键字不许有重复值和空值
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参考答案：
举一反三
【多选题】Tick out some effective ways of an introductory paragraph
A.
Using a topic sentence
B.
Asking a question
C.
Narrating a story
D.
Quoting a famous saying
E.
Providing statistics
F.
Presenting a false idea
G.
Summarizing the main idea
查看完整题目与答案
【多选题】Tick out the safty suggestions mentioned in the dialogue.
A.
Don't run the red light.
B.
Rember the speed limit and don't drive too fast.
C.
Never drive after drinking.
D.
Don't use the mobile phone while driving.
查看完整题目与答案
【单选题】CSMA/CD中，CD的含义是：
A.
CDROM
B.
载波
C.
冲突检测
D.
侦听
查看完整题目与答案
【多选题】目前对短视频营销的定义与对短视频的界定直接相关,这两个方面是?()
A.
媒体形式
B.
时长
C.
媒体平台
D.
内容
查看完整题目与答案
【多选题】Tick out the topics mentioned in the dialogue.
A.
Greeting
B.
Self-introduction
C.
Purpose of visit
D.
Showing interesting in products
E.
Expressing good wishes for cooperation
F.
Weather and journey
G.
Placing a large order and accommodation
查看完整题目与答案
【单选题】原分子中α-1-6糖苷键的形成需要:
A.
差向酶
B.
分支酶
C.
内酯酶
D.
脱支酶
E.
异构酶
查看完整题目与答案
【单选题】Tick out the topic that is NOT mentioned in the passage.
A.
strategy to handle complaints
B.
tourists' needs and expectations.
C.
the cause of the tourists' complaints
D.
tourists' attitude to a tour guide's service
E.
how to improve a tour guide's work
查看完整题目与答案
【单选题】一个人比较持久、相对稳定的思想、情感和行为模式，包括其背后的心理活动过程即是()。
A.
能力
B.
价值观
C.
态度
D.
人格
查看完整题目与答案
【单选题】糖原分子中α-1，6糖苷键的形成需要(    )
A.
差向酶    
B.
分支酶    
C.
内脂酶    
D.
脱支酶    
E.
异构酶
查看完整题目与答案
【多选题】Tick out the questions in the dialogue.
A.
Why do you want to become an auto mechanic?
B.
What do you do at work?
C.
What’s the most difficult part of your job?
D.
What is your goal for the future?
E.
What makes a good auto mechanic?
F.
What is the most important for an auto mechanic?
G.
What skills are required at work?
查看完整题目与答案
相关题目：
【多选题】Tick out some effective ways of an introductory paragraph
A.
Using a topic sentence
B.
Asking a question
C.
Narrating a story
D.
Quoting a famous saying
E.
Providing statistics
F.
Presenting a false idea
G.
Summarizing the main idea
查看完整题目与答案
【多选题】Tick out the safty suggestions mentioned in the dialogue.
A.
Don't run the red light.
B.
Rember the speed limit and don't drive too fast.
C.
Never drive after drinking.
D.
Don't use the mobile phone while driving.
查看完整题目与答案
【单选题】CSMA/CD中，CD的含义是：
A.
CDROM
B.
载波
C.
冲突检测
D.
侦听
查看完整题目与答案
【多选题】目前对短视频营销的定义与对短视频的界定直接相关,这两个方面是?()
A.
媒体形式
B.
时长
C.
媒体平台
D.
内容
查看完整题目与答案
【多选题】Tick out the topics mentioned in the dialogue.
A.
Greeting
B.
Self-introduction
C.
Purpose of visit
D.
Showing interesting in products
E.
Expressing good wishes for cooperation
F.
Weather and journey
G.
Placing a large order and accommodation
查看完整题目与答案
【单选题】原分子中α-1-6糖苷键的形成需要:
A.
差向酶
B.
分支酶
C.
内酯酶
D.
脱支酶
E.
异构酶
查看完整题目与答案
【单选题】Tick out the topic that is NOT mentioned in the passage.
A.
strategy to handle complaints
B.
tourists' needs and expectations.
C.
the cause of the tourists' complaints
D.
tourists' attitude to a tour guide's service
E.
how to improve a tour guide's work
查看完整题目与答案
【单选题】一个人比较持久、相对稳定的思想、情感和行为模式，包括其背后的心理活动过程即是()。
A.
能力
B.
价值观
C.
态度
D.
人格
查看完整题目与答案
【单选题】糖原分子中α-1，6糖苷键的形成需要(    )
A.
差向酶    
B.
分支酶    
C.
内脂酶    
D.
脱支酶    
E.
异构酶
查看完整题目与答案
【多选题】Tick out the questions in the dialogue.
A.
Why do you want to become an auto mechanic?
B.
What do you do at work?
C.
What’s the most difficult part of your job?
D.
What is your goal for the future?
E.
What makes a good auto mechanic?
F.
What is the most important for an auto mechanic?
G.
What skills are required at work?
查看完整题目与答案
参考解析：
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