正确答案: B

顶举法

题目：轴系若按轴承允许负荷原理校中，常采用的校中工艺方法是（）。

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学习资料的答案和解析：

[单选题]为了提高船舶动力装置的经济性，（）部门应对整个动力装置进行综合分析。

A+B+C

[单选题]柴油机排气系统的背压与（）。Ⅰ.废气流速的平方成正比；Ⅱ.与管径的4次方成反比

Ⅰ，Ⅱ都对

[单选题]当柴油机气缸套产生较大拉痕、擦伤、磨台和过度磨损时，应拆下送厂采用（）进行修理。Ⅰ.镀铬；Ⅱ.镗缸；Ⅲ.修理尺寸法；Ⅳ.喷焊；Ⅴ.恢复尺寸法。

C．Ⅱ＋Ⅲ＋Ⅴ

[单选题]In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.

obtain complete burning

[单选题]The main function of the lubrication system in to enable （） of a film of oil between the moving parts.

the formation

[单选题]The pressurized air is usually cooled to increase the charge air （）.

density

[单选题]The essential part of the diesel engine, whose function is to convert the heat energy into the mechanical power, is the （）.

piston

[单选题]The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.

hydraulic “push rods”