若要删除关系S中的行，删除行的值分别列出如下
Ⅰ．('S10'，'宇宙'，'上海')
Ⅱ．('Z01'，'立新'，'重庆')
它们中的()可以被删除。
A. 只有Ⅰ
B. 只有Ⅱ
C. Ⅰ和Ⅱ
D. 都不可以
查看答案
A．It is closed.B．12 noon to 9 p.m.C．9 a.m. to 5 p.m.D．9 a.m. to 12 noon.
A. It is closed.
B. 12 noon to 9 p.m.
C. 9 a.m. to 5 p.m.
D. 9 a.m. to 12 noon.
A．The Best of Jazz.B．Christmas Carols.C．Classical Music.D．Rock Music Collection.
A. The Best of Jazz.
B. Christmas Carols.
Classical Music.
D. Rock Music Collection.
The difference between young Richard and other boys was that he usually did not play with
A. Y
B. N
C. NG
【B1】
A. essentially
B. completely
C. remarkably
D. comparatively
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