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【单选题】
钢在一定条件下淬火后,获得淬硬层深度的能力,称为 ( )A.
淬硬性
B.
耐磨性
C.
强度
D.
淬透性
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皮皮学刷刷变学霸
举一反三
【单选题】设全集U={1，2，3，4，5}，集合M={1， 3，5}，N={3，4，5}，则集合(? U M)∩N=
A.
{4}
B.
{2，3，4，5}
C.
{1， 3，4，5}
D.
Φ
【简答题】设全集U={1，2，3，4，5，6，7，8)，集合M={3，4，5)，集．合N={1，3，6)，则集合P={2，7，8)可表示成 （ ） A．M∪N D．M∩N
【单选题】设集合U={1，2，3，4，5}，集合M={3，5}，N={1，4，5}，则M∩ =' ' （ ）
A.
{5}
B.
{3}
C.
{2，3，5}
D.
{1，3，4，5}
【单选题】设全集U={1，2，3，4，5}，集合M={1，3，5}，集合N={3，4，5}，则集合（C U M）∩N等于（ ）
A.
{4}
B.
{2，3，4，5}
C.
{1，3，4，5}
D.
?
【简答题】Once, long ago, there was a man who traveled from Persia to India on foot. He had been to India before. When he arrived at a village, he happened upon a fruit stand. In that village, fruit was quite b...
【单选题】—How long do you think it will be _______ we get the loan?—Perhaps two or three months.
A.
until
B.
before
C.
when
D.
that
【单选题】It’s not the whole nation rose up and drove the enemy out of their homeland.
A.
before long
B.
long before
C.
soon
D.
a long time
【单选题】Not ____ he died, he received an award for his selfless service to the old. [ ]
A.
long before
B.
before long
C.
long ago
D.
shortly before
【单选题】He said he had been to Hong Kong ____ and he would go there _____ once again. [ ]
A.
long before, before long
B.
before long, long before
C.
long ago, before long
D.
long before, long before
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