A.2mm；50% B.3mm；25% C.3mm；30%
A.100MM B.150MM C.200MM D.300MM
A.经纬仪 B.水准仪 C.罗盘仪 D.万用表
A.50% B.40% C.30% D.20%
A.±50mm B.±10mm C.±100mm D.±20mm
