针阀与针阀体进行滑动试验时，一般将针阀抽出（）配合面长度。

【名词&注释】

经济性(economy)、船舶动力装置(marine power plant)、喷油器(injector)、密封性试验(leak test)

[单选题]针阀与针阀体进行滑动试验时，一般将针阀抽出（）配合面长度。

A. 1/3
B. 2/3
C. 1/2
D. 3/4

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学习资料：

[单选题]为了提高船舶动力装置的经济性，（）部门应对整个动力装置进行综合分析。

A. 设计
B. 制造
C. 使用
D. A+B+C

[单选题]船上吊缸检修一般不必进行（）。

A. 喷油器启阀压力试验
B. 喷油器雾化试验
C. 柱塞偶件的密封性试验^{(leak test)}
D. 气缸余隙测量

[单选题]底脚螺栓的作用是将（）牢牢地固定在一起。Ⅰ.柴油机机座；Ⅱ.船体双层底底座；Ⅲ.固定垫块；Ⅳ.活动垫块。

A. Ⅰ＋Ⅱ
B. Ⅰ＋Ⅱ＋Ⅲ
C. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ
D. Ⅰ＋Ⅱ＋Ⅳ

[单选题]（） fuel oils （） lubricating oils require treatment before passing to the engine.

A. Both；and
B. Neither；nor
C. Either；or
D. Both；or

[单选题]Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.

A. to stiffen
B. to soften
C. to loosen
D. to wear

[单选题]The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.

A. shut
B. closing
C. opened
D. closed

[单选题]The way to reduce （） is to build up a film of lubricant between any two surfaces that rub against each other.

A. friction
B. collision
C. inertia
D. resistance

[单选题]（）, so they are widely used on board ship nowadays.

A. Diesel engines have more advantages in comparison with gasoline engines
B. Diesel engines have more advantages in comparison to gasoline engines
C. Gasoline engines have more advantages in comparison with diesel engines
D. Gasoline engines have more advantages in comparison to diesel engine

[单选题]Cross scavenging requires the fitting of （） to prevent air or exhaust gas escape when the piston is at the top of the stroke.

A. a exhaust valve
B. a piston skirt
C. a piston crown
D. an air suction valve

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