正确答案: C

almost invariably solid forged

题目：Crankshafts of medium speed engines are （） from a single piece of steel.

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学习资料的答案和解析：

[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。

不高于

[单选题]增压器的转子是在拆下（）以后，从（）端抽出来的。

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。

B．e

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

a transfer pump

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

scavenging air

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

breakdown of the lubricating oil by dilutio