A.Stranding on rocks during fog B.Fire at sea C.Rough sea beating into a ship D.The decaying of the cargo
A.出發(fā)點B.維持點C.立足點D.基礎(chǔ)點
A.混凝土板下空隙內(nèi)存在自由水B.軸載的反復(fù)作用C.細集料的供給D.低溫