A.在規(guī)范基礎上減少2m B.在規(guī)范基礎上減少4m C.在規(guī)范基礎上減少不超過25% D.仍不應減少
A.不限 B.不小于3.5m C.不小于4m D.不小于6m
A.50m,30m B.35m.30m C.50m,25m D.35m,20m