Each crank is made up of two crank webs joined by a common（

【名词&注释】

可靠性(reliability)、环境温度(ambient temperature)、压力表(pressure gauge)、穿透性裂纹、成本低(low cost)、柴油机燃烧室(combustion chamber of diesel engine)、冷却水压、曲轴箱油(crankcase oil)

[单选题]Each crank is made up of two crank webs joined by a common（） to which the bottom endbearing is fitted.

A. throw
B. crankshaft
C. crankpin
D. crosshead

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学习资料：

[单选题]可靠性定义中所述及的“规定的条件”，包括（）。Ⅰ.环境温度、压力、湿度；Ⅱ.振动；Ⅲ.承受的负荷

A. Ⅰ+Ⅱ
B. Ⅱ+Ⅲ
C. Ⅰ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

[单选题]柴油机运转中，根据（）现象可迅速判断柴油机燃烧室^{(combustion chamber of diesel engine)}零件是否产生穿透性裂纹。Ⅰ.冷却水压力表指针波动；Ⅱ.冲车时有水珠喷出；Ⅲ.缸壁面有锈痕；Ⅳ.膨胀水柜水位变化；Ⅴ.曲轴箱油^{(crankcase oil)}位升高。

A. Ⅰ＋Ⅳ＋Ⅴ
B. Ⅰ＋Ⅱ＋Ⅴ
C. Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ＋Ⅴ
D. Ⅱ＋Ⅲ＋Ⅳ

[单选题]船轴腐蚀主要发生在（）。

A. 推力轴
B. 中间轴
C. 艉轴
D. 曲轴

[单选题]平板形舵具有（）的特点。Ⅰ.结构复杂；Ⅱ.便于修造；Ⅲ.舵效高；Ⅳ.舵效低；Ⅴ.成本低。

A. Ⅰ＋Ⅱ
B. Ⅰ＋Ⅳ＋Ⅴ
C. Ⅱ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ

[单选题]（） is made of a boss with separated blades mounted into it.

A. A variable pitch propeller
B. A variable pitch nut
C. A fixed pitch parallel
D. A fixed pitch screw

[单选题]As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can regulate （）.

A. the inlet valve
B. the outlet valve
C. both the inlet valve and the outlet valve
D. the pump inlet valve

[单选题]Excessive alkalinity of the water in an auxiliary boiler can cause （）.

A. caustic embrittlement of the boiler metal
B. acidic corrosion of the boiler metal
C. hard scale deposits on the boiler tubes
D. etching of the heat exchange surface

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