A.±10√Lmm B.±20√Lmm C.±30√Lmm D.±40√Lmm
A.100.330m B.100.430m C.100.530m D.100.630m
A.晴天大風(fēng) B.晴天無(wú)風(fēng) C.雨天 D.下雪