平板形舵用于（）。

【名词&注释】

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[单选题]平板形舵用于（）。

A. 内河中、小船舶
B. 沿海中、小船舶
C. 小船、非自航船
D. 帆船、驳船

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学习资料：

[单选题]修复后气阀装入阀座与锥面接触面积不得少于原接触面积的（）。

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

[单选题]During the suction stroke, the piston is moving （）.

A. inwards
B. outwards
C. downwards
D. upward

[单选题]Increased air （） will raise scavenge efficiency and allow a greater mass of air to be compressed； more fuel may now be burned giving an increased power.

A. specific volume
B. density
C. viscosity
D. calorific value

[单选题]The main bearings are provided with thin-walled （）, lined with a copper-lead alloy.

A. steel guides
B. steel shells
C. steel bearing caps
D. pig iro

[单选题]The most important factor that causes the wear of the engine parts is （）.

A. excessive heat
B. friction
C. oxidation
D. high pressure

[单选题]If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.

A. cylinder compression pressure may not be high enough
B. cylinder compression temperature may be too high
C. fuel oil injection pressure may not be high enough
D. scavenge and purge process is incomplete

[单选题]Lube oil cannot be efficiently filtered if its （）.

A. viscosity is too low
B. temperature is too low
C. pump discharge pressure is higher than the systems pressure
D. pump capacity is greater than the systems need

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