按操作系统的分类，Unix属于______操作系统。

按操作系统的分类可知，Dos操作系统属于顺序执行操作系统，Unix操作系统属于（）操作系统，VxWorks属于（）操作系统。

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。

综采维修钳工常用的扳手有开口扳手，梅花扳手（）

综采维修钳工常用的一般扳手有（）扳手等。

下列属于钳工的常用设备的有（）、钻床、钳台等。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。