判断题

某GPS点的高程异常值等于该点的正常高与大地高之差。

答案：正确

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单项选择题

WPA is suitable insurance policy for ( ).

A、Cheap and bulk cargos
B、Goods that can be easily damaged by sea water
C、Goods may be damaged during transit but less likely lose their uses due to the damages
D、Goods which are very prone to damages during transit

对流层对人类的影响不大，特别是距地面1～2km的大气边界层。

答案：这个说法是不准确的。实际上，对流层对人类的影响非常大，尤其是距地面1～2公里的大气边界层，即行星边界层，对人类活动和环境...