The term （） linguistics may be defined as a way of referring to the approach which studies language change over various periods of time and at various historical stages.

A diesel engine burns （） a gasoline engine of the same capacity in the same period of time.

If the Charterer sends the vessel on her last voyage at a time when there is no expectation that she will be redelivered within a reasonable time of the end of the period of the Charterparty，and she is in fact redelivered late，he（）.

The passing of a low pressure system can be determined by periodically checking the（）.

If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the （）.

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.

If the engine （） for a long period, there will be a danger of frost.

The records of ship security training, drills and exercises shall be kept in the working language or languages of the shipIf the language or languages used are not（）, a translation into one of these languages shall be included.

If over a period of weeks the air-box pressure of a turbo-charged, diesel engine, operating at full load, appears to be dropping off, the cause can be （）.

When the period of beam seas equals the natural rolling period of a vessel，what will most likely occur?（）

rogram propagates itself by modifying other programs to include a possibly changed copy of itself and that is executed when the infected program is(67). A virus often causes damage or annoyance and may be triggered by some event such as the occurrence of a predetermined date.Worm is a self-contained program that can propagate itself through data processing systems or computer networks. Worms are often designed by hackers to use up(68) resources such as storage space or processing time.Trojan horse implies by the name an apparently harmless program containing(69) logic that allows the unauthorized collection, falsification or destruction of data. Logic bomb causes damage to a data processing system when triggered by some specific system condition. Time bomb is also a malicious program being activated at a(70) time.

The （） is used to measure the volume of a liquid or gas through a pipeline within any given period of time.