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【单选题】
用水准测量法测定A、B两点的高差，从A到B共设了两个测站，第一测站后尺中丝读数为1234，前尺中丝读数1470，第二测站后尺中丝读数1430，前尺中丝读数0728，则A、B两点间的高差为（）米。A.
A 、 -0.938
B.
Ｂ、 -0.466
C.
Ｃ、 0.466
D.
Ｄ、 0.938
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