在机械加工中，提高零件加工精度的工艺措施有哪些？

零件机械加工顺序的安排,一般应遵循( )的原则。

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.

When loading or discharging dry mud or cement，crew members should use goggles and（）.

零件机械加工顺序的安排，一般是（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

凹模制造工艺过程中工艺阶段的划分和一般机械零件基本相同，可分为粗加工、半精加工、精加工和（）四个阶段。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。