单项选择题
如图所示水准网，选取
，
点高程平差值作为未知参数
，
，已求得其法方程为
，求
平差值的权倒数。
A.
2/9 B.
-2/9 C.
5/9 D.
-5/9
如图所示水准网，选取
，点高程平差值作为未知参数，，已求得其法方程为，求平差值的权倒数。A.
2/9 B.
-2/9 C.
5/9 D.
-5/9
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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 ______.
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