In a purifier changing to a gravity disc with larger hole di

【名词&注释】

涡轮增压器(turbocharger)、符合要求(meet the requirement)

[单选题]In a purifier changing to a gravity disc with larger hole diameter will move the interface towards the （）.

A. bowl periphery
B. bowl center
C. upper surface
D. lower surface

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[单选题]轴承在涡轮增压器中居重要地位，它应保证（）。Ⅰ.转子的平衡合格；Ⅱ.可靠地高速回转；Ⅲ.转子运转平稳；Ⅳ.准确固定转子位置；Ⅴ.转子与定子的间隙符合要求。

A. Ⅱ＋Ⅲ＋Ⅳ
B. Ⅰ＋Ⅱ
C. Ⅰ＋Ⅱ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅳ

[单选题]The words such as quantity, grade, viscosity and specific gravity should be in the （）.

A. repair list
B. spare parts order list
C. price list
D. bunker list

[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]High firing pressures and a low exhaust temperature in a diesel engine may result from （）.

A. decreased piston to cylinder head clearance
B. increased exhaust system back pressure
C. early fuel injection timing
D. low scavenge air temperature

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