A.not to affect the draught trim B.not to affect the cargo ventilation C.not to affect the free surface D.not to affect the vessel's stability
A.分段診刮B.盡快行宮腔鏡檢查C.盆腔超聲D.病理診斷
A.高利潤區(qū)B.低利潤區(qū)C.趨于比較平緩的利潤