Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to （）.

Off hire is when a vessel breaks down，strands，or has any damage that prevents the working of cargo or delays the sailing of the vessel．Under which of the following charter parties is off hire most likely to be mentioned?（）.

In most WANs, the network contains numerous cables or telephone lines, each one connecting a pair of

（）外语导游员要求熟练掌握一门外语，初步掌握一门第二外语。

A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame（）.

A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a（）.

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（）.

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.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and（）refers to call issues that cause variations in timing or time of arrival. 

Jitter is an unwanted variation of one or more characteristics of a periodic signal in electronics and telecommunications and（）refers to call issues that cause variations in timing or time of arrival.

Strainers, sometimes called （）, are devices designed to prevent the passage of unwanted solids into or further along a system.