Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

铲运机、推土机、单斗挖土机均能直接开挖的土有（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

具备“后退向下，强制切土”特点的单斗挖土机为（）。

具有“后退向下,强制切土”特点的单斗挖土机是什么挖土机?( )

具有“后退向下，强制切土”特点的单斗挖土机是什么挖土机？（　　）

拉铲挖土机的挖土特点是：（），自重切土，其挖土半径和挖土深度较大，但不如反铲灵活，开挖精确性差。