A.when was your vessel built B.at what time is your vessel building C.when is your vessel built D.at what time you built your vessel
A.混凝土板下空隙內(nèi)存在自由水B.軸載的反復作用C.細集料的供給D.低溫
A.用切削機械鑿除錯臺,修補縱坡變化控制在1%B.換板處理C.不用處理D.填料找平