内容正文:
包钢四中高三月考数学(文)试卷2017-9-25
一.选择题(每小题5分,共60分)
已知集合
,则集合
中元素的个数( )
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设
,则
的( )
充要条件
充分不必要条件
必要不充分条件
既不充分也不必要条件
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