A.0.1m B.0.30m C.1m D.0.3+0.035V2m
A.50mm B.0.50m C.1m D.1.0+0.035V2m
A.不應(yīng)大于0.5m/s B.不應(yīng)大于0.63m/s C.不應(yīng)大于1.0m/s D.無限制