题目内容

A.OrB.HoweverC.NeverD.Meanwhile

A. Or
B. However
C. Never
D. Meanwhile

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A.asB.thanC.as much asD.that

A. as
B. than
C. as much as
D. that

The new car at the motor-show was a very unusual shape.

A. rare
B. common
C. strange
D. curious

下面集合之间的包含和属于关系中为真的是 Ⅰ.
Ⅱ.{Ф}∈{Ф,{Ф,{Ф}}}
Ⅲ.{a,b}∈{a,b,{a,b}}
Ⅳ.{a,b}∈{a,b,{a,b,c}}

A. Ⅰ和Ⅱ
B. Ⅰ和Ⅲ
C. Ⅰ和Ⅳ
D. Ⅱ、Ⅲ和Ⅳ

The most commonly used locked level in implementing concurrency control is at which of the

A. record
B. database
C. table
D. field

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