A.豎向6m,水平向6m B.豎向5m,水平向5.4m C.豎向4.5m,水平向5.4m D.豎向4.5m,水平向6m
A.大于2mB.大于3mC.大于3.5mD.大于4.5m
A.大于200mm和不小于100mm B.大于80mm和不小于50mm C.大于40mm和不小于200mm D.大于100mm和不小于50mm