简述脑力疲劳主要由单调作业而引起，可采取哪些措施来避免单调作业。

口服补液及时纠正脱水，应用ORS，说法正确的是（）

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.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

简述人因工程学成为独立学科的标志。

人因工程学就是研究（）三者之间相互关系的学科。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

远景尽量选择（）以形成画面层次，避免平板单调。