(单项选择题)(中)(水准测量)() 附合水准路线BM

(单项选择题)(中)(水准测量)() 附合水准路线BM

A.6mm.9mm.6mm

B.7mm.7mm.7mm

C.-7mm.-7mm.-7mm

D.-6mm.-10mm.-5mm

正确答案是A