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【单选题】

A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.

A、damage from crane operations

B、being used for wash down purposes

C、accidental diversion of flow to wrong location

D、freezing

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第1题
[] The purpose of the delivery check valve used in a diesel fuel injection jerk pump is to （）.

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第2题
[] On a ship，the possibility of a blowout makes which type of diesel engine shutdown desirable?（）

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第3题
[单选题] In some type of two-stroke engines, besides some small holes for（）, starting valve, safety valve, indicator cock, and central opening in each cylinder cover for mounting the（）

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第4题
[单选题] There are about 130 prison establishments in England and Wales and some 20 in Scotland,many of which were built in the（）century.

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第5题
[] 发动机起动手柄的工作位置包括（）

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第6题
[单选题] The Renaissance began in northern Italy in the early（）century,and was typified by the universal genius of Leonardo Da Vinci.

A、11th  B、12th  C、13th  D、14th  

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第7题
[单选题] In the suction stroke air is induced into the cylinder （）In the compression stroke the air is compressed.

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第8题
[单选题] （） are used to limit the pressure in any particular portion and mainly control the pressure after the valve.

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第9题
[单选题] In a hydraulic system, （） are used to protect the system from over pressure.

A、stop valves  B、check valves  C、safety valves  D、reducing valves  

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