备车时间的长短，各类船舶有所不同，一般在（）h。

【名词&注释】

玻璃钢(frp)、橡胶套(rubber tubing product)

[单选题]备车时间的长短，各类船舶有所不同，一般在（）h。

A. 0.5—6
B. 1—2
C. 2—3
D. 1—5

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学习资料：

[单选题]水润滑式艉轴工作轴颈包覆（），非工作轴颈包覆（）。

A. 铜套/塑料
B. 橡胶套/塑料
C. 玻璃钢套/橡胶
D. 铜套/玻璃钢

[单选题]An aluminum piston has lower inertia and higher coefficient of （） compared to that of cast iron.

A. viscosity
B. twisting moments
C. inertia
D. thermal expansio

[单选题]Heat energy is a source of power, but （） will cause damage to the engine.

A. excessive heat
B. insufficient heat
C. effective cooling
D. high output

[单选题]Low compression of diesel engine may result from （）

A. a worn cylinder
B. broken piston rings
C. any of A and B
D. none of the above

[单选题]The scavenging air ports are located at （） that they are just exposed by the upper edge of the piston when the piston is in the bottom dead center position.

A. so a height
B. such a height
C. so high
D. such high

[单选题]Valve gear knocks are more easily located while the engine （）.

A. is running
B. stops
C. is repaired
D. lacks of oil

[单选题]Vents are led from the engine to the head tank for the release of （） from the cooling water.

A. air
B. heat
C. sludge
D. steam

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