问答题

Which instrument is the most widely used one in international settlement?
A、cash
B、check
C、promissory note
D、bill of exchange

答案： D

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单项选择题

设X1，X2,…,Xn是从某总体X中抽取一个样本，下面哪一个不是统计量

In imagining putting a crooked picture straight, the author becomes more and more awake rather than sleepy.
正确
错误

答案：正确