刀具的刃倾角是在什么坐标平面内测量？如何测量？它对切削加工有什么影响？如何取值？

简述布尔算符（OR）的作用。

OR指令的作用是: 。( )

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.

合金工具钢主要用来制造具有较高切削速度及形状复杂的刀具，可以制造铣刀、铰刀。

在刀具材料中，（）用于切削速度很高、难加工材料的场合，制造形状较简单的刀具。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。