单项选择题
A.30~50m;1.5~2.0mB.30~50m;0.5~1.0mC.10~30m;0.5~1.0mD.10~30m;1.5~2.0m
A.5~10,30B.5~10,60C.10~15,30D.10~15,60
A.0.028B.0.030C.0.032D.0.034