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
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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