凸轮机构在工作中产生刚性冲击的原因是瞬时加速度（）

V带传动的传动比不恒定的主要原因在于存在弹性滑动。

带传动工作时产生弹性滑动的原因在于带的紧力和松边拉力不等以及带的弹性变形。

零件在工作中发生断裂或不允许的残余变形统属于刚度不足；零件在工作中产生过量弹性变形属于强度不足。

在带传动中，弹性滑动是（）避免的，打滑是（）避免的。

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.

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。

为什么说弹性滑动是带传动固有的物理现象？