After fitting back in place the gear wheels, dont forget （

【名词&注释】

螺旋桨鸣音

[单选题]After fitting back in place the gear wheels, dont forget （） them.

A. to grease
B. greasing
C. oiling
D. lubricating

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[单选题]针阀体的喷孔磨损后使孔径增大（）时需要换新针阀体。

A. 10%
B. 20%
C. 30%
D. 40%

[单选题]消除螺旋桨鸣音的方法是（）。

A. 加工成特殊边缘
B. 加厚导边厚度
C. 改变0.4R以外一段随边边缘厚度
D. A或B或C

[单选题]The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives （）.

A. the oil separator
B. the fresh water generator
C. the compressor
D. fire pum

[单选题]（） the cylinder walls, the heat passes through them by conduction.

A. When receiving by
B. When received by
C. In order to receiving
D. In order to receive

[单选题]One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.

A. casting interlocking components
B. welding plates to form sections for assembly
C. forging integral components
D. case hardening integral component

[单选题]The bearings used to support the crankshaft are generally called （）

A. line shaft bearings
B. connecting rod beatings
C. main bearings
D. support bearing

[单选题]Fuel injection systems meter fuel, atomize fuel, and （）.

A. create turbulence in the combustion chamber
B. aid in completing cylinder scavenging
C. inject fuel at the proper time
D. minimize fuel penetration into the cylinder

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