判断题

CRM stands for customer relationship management. ()
A、正确
B、错误

答案：正确

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单项选择题

If time series  can be used to predict , which of the following hypothesis must stand for the following formula?

A、
B、
C、At least one of  is not zero.
D、At least one of  is not zero.

单项选择题

2.若逻辑运算的求值规则为：参与运算的两个量都为假时，结果才为假。该运算是（）。
A、逻辑与运算
B、逻辑非运算
C、逻辑或运算
D、逻辑加运算