单项选择题
A.2m B.4m C.6m D.8m
A.0.2-0.5m B.0.3-0.7m C.0.5-0.8m D.0.3-0.6m
A.25mm B.30mm C.35mm D.40mm
A.1~2 B.2 C.2~3 D.3
A.1/25 B.1/50 C.1/100 D.1/200
A.A;上行 B.B;上行 C.A;下行 D.B;下行
A.1100 B.1200 C.1000 D.1500
A.S B.O C.I D.U
A.1 B.2 C.3 D.4
A.12 B.24 C.36 D.48