为了防止涡轮壳体电化学腐蚀，除用淡水冷却外，可以采用（）等方

【名词&注释】

阴极保护(cathodic protection)、防腐剂、电化学腐蚀(electrochemical corrosion)、喷油器(injector)、保护膜(protective film)、进出港、增压器转子(blower rotor)

[单选题]为了防止涡轮壳体电化学腐蚀，除用淡水冷却外，可以采用（）等方法。Ⅰ.壳体表面覆盖保护膜；Ⅱ.阴极保护；Ⅲ.阳极保护；Ⅳ.淡水中加防腐剂；Ⅴ.安装防腐锌块。

A. Ⅱ＋Ⅳ
B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C. Ⅰ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅱ＋Ⅴ

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学习资料：

[单选题]目前，新型大型低速柴油机已全程使用重油，正常营运期间如靠泊码头、进出港都不换油。为此它的喷油器和高压油泵都有改进.其喷油器在实验台上试验，如发现喷油器内油压很低（0.5～0.8MPa）时，回油管内有大量的燃油流出，则（）。

A. 可以断定内部密封面密封不良
B. 说明喷油器针阀密封不良
C. 说明正常，继续升高油压，回油就会停止
D. 说明喷油器组装不对，需解体重装

[单选题]保证增压器转子^{(blower rotor)}受热膨胀不会产生压气机叶轮与气封板碰撞的间隙是（）值。

A. K
B. L
C. M
D. N

[单选题]增压器转子^{(blower rotor)}校中时不需检测（）。

A. 转子轴向串动量
B. 压气机叶轮的前间隙
C. 压气机叶轮的后间隙
D. 各轴承的轴承间隙

[单选题]由于轴系的实际变形难以检测，通过测量轴系的相邻轴两法兰的（）来了解轴系轴心线的实际状态。

A. 偏移值
B. 偏心值
C. 偏中值
D. 曲折值

[单选题]A distance piece, with ground faces, known as a compression plate, may be interposed between the rod and the beating housing, its thickness being chosen to ensure the correct （）.

A. compression pressure
B. compression test
C. compression ratio
D. compression clearance

[单选题]Fuel pump index is （）.

A. the viscosity index
B. the fuel oil contents
C. the starting speed
D. the reading at the rack

[单选题]The trouble-free life of an engine indicates （）.

A. the period of time during which no trouble occurs to the engine
B. no trouble will occur to the engine all its life
C. trouble may occur freely to the engine
D. no matter what you do to the engine, no trouble will occur during this period

[单选题]Auxiliary boilers are divided into several classifications, one of which is （）.

A. water-tube supercritical circulation
B. water-tube forced circulation
C. fire-tube controlled circulation
D. fire-tube express circulatio

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