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【单选题】
The average time between two high waters is 12 hours and 25 minutes because this is the time it takes for ____.A.
The sun to be at the opposite side of the moon
B.
The moon to be at the opposite side of the earth
C.
The moon to be at its apogee
D.
The sun and the moon to be on the same side
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【简答题】休止角是测量粉体堆成的椎体的与________平面的夹角,计算公式为________。
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