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【单选题】
下列对索引描述不正确的是（ ）。A.
建立索引可以加快对表中数据的检索
B.
索引建得越多越好
C.
每个索引都会占用一定的物理空间
D.
中添加主键约束时，SQL Server将自动为这些约束的列创建索引
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皮皮学刷刷变学霸
举一反三
【单选题】The man will probably take his elective courses in which area?
A.
American literature.
B.
World literature.
C.
Literary analysis.
D.
Surveying.
【单选题】听力原文：M: I have registered two elective courses for next semester. How about you? W: Well, I haven't decided yet, because I'll have more required courses next term. Q: What do we know from the conversa...
A.
The man will have two required courses next semester.
B.
The woman has not made a decision yet.
C.
The man will have to make a decision.
D.
The woman will have two elective courses next tern.
【简答题】Counselors try to _____________ the parents when they help students choose elective courses.
【单选题】强心苷的分子结构中含有以下何种基团不能用氧化铝色谱分离:
A.
C3-OH
B.
Cl4-OH
C.
Cl6-OH
D.
Cl6-OCOCH3
E.
Cl2-OCOCH3
【简答题】We have to take some elective courses and ________________(必修课) to gain enough credits.
【单选题】To verify that your printer is operating correctly, you can run the printer(75)program。
A.
driver
B.
view
C.
browse
D.
self-test
【判断题】When the Java program is run for the first time, it is slower than the C program.
A.
正确
B.
错误
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