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【多选题】
7-脱氢胆固醇不能转化的维生素是()
A.
维生素D1
B.
维生素D2
C.
维生素D3
D.
维生素D4
E.
维生素D5
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【多选题】抽样推断中，样本容量的多少取决于()。
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总体标准差的大小
B.
允许误差的大小
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【单选题】---How long have you been in London?  ---_________.
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【简答题】Listen to the following conversations and fill in the blanks with the words or expressions you have heard. Dialogue 1 FIT Reservation R (Reservationist) G(Guest) R: Good morning. Sir, Swan Hotel. May ...
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