Crankshafts of medium speed engines are （） from a single p

【名词&注释】

增压器(turbocharger)、不可靠度(unreliability)、不低于(no less than)

[单选题]Crankshafts of medium speed engines are （） from a single piece of steel.

A. unusually solid welded
B. never be solid forged
C. almost invariably solid forged
D. almost invariably be welded

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学习资料：

[单选题]并联连接系统的不可靠度（）系统中任一并联部件的不可靠度。

A. 不高于
B. 等于
C. 不低于
D. 高于

[单选题]增压器的转子是在拆下（）以后，从（）端抽出来的。

A. 涡轮端的废气进气壳/涡轮
B. 涡轮端的废气进气壳/压气
C. 压气端的空气进气壳/涡轮
D. 压气端的空气进气壳/压气

[单选题]对于质量分布在同一平面内，轴向长度较小的回转件，其平衡精度用（）表示。

A. A．FR
B. B．e
C. C．e×ω
D. D．G

[单选题]Fuel oil is pumped by means of （） from the bunker tanks.

A. a transfer pump
B. a bilge pump
C. a service pump
D. a vacuum pum

[单选题]A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.

A. cylinder heads
B. exhaust valves
C. scavenging air
D. injector

[单选题]In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.

A. metal particles loosened by wear
B. air when no air cleaners are used
C. condensation of water vapors
D. breakdown of the lubricating oil by dilutio

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