A.接續(xù)管不小于90% B.接續(xù)管不小于95% C.螺栓式耐張線夾不小于90% D.螺栓式耐張線夾不小于95%
A.越少 B.不變 C.越大 D.減少
A.防銹濟 B.油漆 C.汽油 D.中性凡士林