單項(xiàng)選擇題設(shè)A點(diǎn)后視讀數(shù)為1.032m,B點(diǎn)前視讀數(shù)為0.729m,則AB的兩點(diǎn)高差為多少米?()。

A.-29.761
B.-0.303
C.0.303
D.29.761


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