题目内容

There are various places for market information collection such as hotels, shops, and consultants as long as you have patience and persistence.

A. 对
B. 错

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Many motivation studies are made with present customers for the sake of marketing expansion.

A. 对
B. 错

When faced with attack, a company needs to expand its market coverage.

A. 对
B. 错

GPS系统地面控制部分由__个主控站，_个全球监测站，____个地面控制站。

GPS的特点有哪些？