判断题

番杏科和景天科可以混植在一起，组盆景。
正确错误

答案：错误

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On the whole, there are some 5,300 US colleges or universities, which normally comprise at least four categories of institutions across the whole country, such as public or private colleges or universities, four-year colleges or universities, and so on.___________

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单项选择题

超滤膜的孔径为（）‌

A、2-50nm
B、0.05-10μm
C、0.1～1nm
D、0.1～2nm