A.前視讀數(shù)+前視點(diǎn)高程 B.后視讀數(shù)+后視點(diǎn)高程 C.前視讀數(shù)+后視點(diǎn)高程 D.后視讀數(shù)+前視點(diǎn)高程
A.4 B.2 C.5 D.3
A.1/8000 B.1/6000 C.1/2000 D.1/4000