题目内容

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

A. 对
B. 错

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更多问题

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？

GPS定位原理是什么？