A.對(duì)中 B.瞄準(zhǔn) C.整平 D.歸零
A.120°10′ B.130°30′ C.317°10′ D.37°10′
A.1/100或1/50 B.1/200或1/500 C.1/500或1/1000 D.1/1000或1/2000