判断题

粉丝定位是指运营者在运营账号时寻找的垂直领域。

答案：正确

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输入端定义误差的象函数E(s)与输出端定义误差的象函数E’(s)之间差一个检测元件的动态H(s)，E(s)= H(s) E’(s)
正确
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答案：正确

单项选择题

Mass advertising helped to ____ the emphasis from the production of goods to their consumption.
A.vary
B.shift
C.lay
D.moderate