单项选择题

Which of the following is not mentioned as a type of business English?
A、Operation manuals.
B、Memorandum.
C、Business correspondence.
D、Commercial advertisements.

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不定项选择

‏氨基甲酸酯是一种胆碱酯酶抑制剂，与胆碱酯酶结合形成一种易于分解的络合物。（）‏

A．正确
B．错误

单项选择题

Assume that the probability density function of (X,Y) is ,then X and Y are not independent but have the same distribution.
A、正确
B、错误