在车辆中有些控制器采用步进电机，是因为步进电动机与标准直流电机比较，其最大的优点是（）

口服补液及时纠正脱水，应用ORS，说法正确的是（）

数控机床伺服系统常用的执行元件有：步进电机、直流伺服电机、交流伺服电机及（）。

数控机床伺服系统常用的执行元件有：（）、直流伺服电机、交流伺服电机及直线电机。

电机按形式可分为直流、（）、（）电机三种。

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。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。