判断题

只要在丰水期有足够的补给资源,在枯水期无论如何使用多少地下水(储存资源)都是合理的。



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单项选择题

The average time between two high waters is 12 hours and 25 minutes because this is the time it takes for ______.

A.A. The sun to be at the opposite side of the moon
B.B. The moon to be at the opposite side of the earth
C.C. The moon to be at its apogee
D.D. The sun and the moon to be on the same side

不定项选择

测定水样的SS时,必须进行单独采样。

A.正确
B.错误