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单项选择题

P and S are used to show the tanks. P and S stand for____________

A． Port and Stevedore
B． Port and Starboard
C． Person and Station
D． Put and Send

判断题

GPS 信号接收机，其主要功能是能够捕获到，按一定卫星截止角所选择的待测卫星，并跟踪这些卫星的运行。