单项选择题
A.The running reflection B.The turning effect C.The moving speed D.The changing sensibility
A crack in the deck plating of a vessel may be temporar...
单项选择题A crack in the deck plating of a vessel may be temporarily prevented from increasing in length by（）.
A.cutting a square notch at each end of the crack B.drilling a hole at each end of the crack C.slot-welding the crack D.welding a doubler over the crack
