研磨机研磨的是催化研磨机与电机的传动主要是（）。

最适合打磨铝合金的研磨机是（）。 

（）研磨机主要用于粗、中腻子平面打磨。

单向旋转式研磨机适用于平面打磨。

（）研磨机主要用于除锈、去旧漆等粗磨工作。

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.

配合球磨机的离心式粗粉分离器它主要由（），回粉管，（）等组成。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

山西大学改为国立后，工学院存在哪些系？（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。