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