一偏置直动平底从动件盘形凸轮机构，平底与从动件运动方向垂直，凸轮为主动件，该机构的压力角（）。

直动尖顶从动件盘形凸轮机构的压力角是指（）；直动滚子从动件盘形凸轮机构的压力角是指（）；而直动平底从动件盘形凸轮机构的压力角等于常数。

在设计直动平底从动件盘形凸轮机构时，若出现运动失真现象，则应（）。

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。

在图示直动尖顶从动件盘形凸轮机构中，凸轮转向如图所示。试画出该位置时从动件 压力角

图所示为一偏置直动从动件盘形凸轮机构。已知AB段为凸轮的推程廓线，试在图上标注推程运动角。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。