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【多选题】
属于全发酵茶的选项是 。A.
祁门红茶
B.
枞
C.
云南滇红
D.
E.
黄山毛峰
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反馈参考答案：
举一反三
【单选题】关于关系模式的键,以下说法正确的是()。
A.
一个关系模式可以有多个主键
B.
一个关系模式可以有多个候选键
C.
主键所包含的属性称为主属性
D.
不是哪个关系模式都有键
【单选题】“It looks as if he were drunk.” “So it does. _____.”
A.
He’d better give up drinking
B.
He shouldn’t have drunk so much
C.
Health is more important than drink
D.
I wonder why he is always doing so
【单选题】关于关系模式的关键字,以下说法正确的是()
A.
一个关系模式可以有多个主关键字
B.
一个关系模式可以有多个候选关键字
C.
主关键字可以取空值
D.
有一些关系模式没有关键字
【单选题】The pills him.If only he had taken them regularly.
A.
could help
B.
may help
C.
must have helped
D.
might have helped
【单选题】The lad couldn’t ______ even if he ______ in time.
A.
have been saved; had been treated
B.
be saved; have been treated
C.
be saved; had been treated
D.
had been saved; would have been treated
【单选题】—Why didn't Mr. Smith give you one of his newlypublished books? —I didn't want one, but he would have given me one if I ________. [ ]
A.
did
B.
would
C.
will
D.
had
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