床上镗孔和车床上镗孔有何不同，分别用于什么场合？

镗孔只能在镗床、车床上进行，不能在铣床或钻床上进行。

车床上镗孔和镗床上镗孔有何不同？它们各用于什么场合？

数控车床加工零件是（）沿工件轮廓移动，同时工件绕主轴旋转，从而完成回转体零件的加工.

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。

车床上镗削内孔时，必须使工件孔轴线同车床主轴回转轴线（）。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。