正确答案: C

小船、非自航船

题目：平板形舵用于（）。

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学习资料的答案和解析：

[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（）。

1/3

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

downwards

[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.

density

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

steel shells

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

friction

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

cylinder compression pressure may not be high enough

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

temperature is too low