问答题

简要论述害虫防治的主要技术措施。

答案：害虫防治的主要技术措施包括以下几个方面：1. 农业防治：通过调整种植结构、轮作倒茬、合理密植、及时清除田间杂草和病残体等...

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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

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