针阀偶件锥面配合面密封的要求是（）。Ⅰ.形成面接触；Ⅱ.形成线接

【名词&注释】

增压器(turbocharger)、填料函(stuffing box)、工作条件(working condition)、活塞杆填料、四冲程柴油机(four-stroke diesel engine)、要注意(should be noticed)

[单选题]针阀偶件锥面配合面密封的要求是（）。Ⅰ.形成面接触；Ⅱ.形成线接触；Ⅲ.密封带宽度为0.3～0.5mm；Ⅳ.密封带宽度为0.1～0.3mm；Ⅴ.针阀锥角大于针阀体锥角0.5°～1°。

A. Ⅱ＋Ⅲ＋Ⅳ
B. Ⅰ＋Ⅲ＋Ⅳ
C. Ⅱ＋Ⅳ＋Ⅴ
D. Ⅱ＋Ⅲ＋Ⅴ

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学习资料：

[单选题]组装活塞杆填料函中的刮油环和组装四冲程柴油机^{(four-stroke diesel engine)}活塞上的刮油环时，都会有弹簧。组装时要注意^{(should be noticed)}前者的弹簧装在刮油环的（），后者的弹簧装在刮油环的（）。

A. 内圆面/外圆面
B. 内圆面/内圆面
C. 外圆面/内圆面
D. 外圆面/外圆面

[单选题]增压器的轴承一般以（）端的轴承先损坏，因该处（）、工作条件差。

A. 压气/承受轴向推力
B. 压气/温度高
C. 涡轮/承受轴向推力
D. 涡轮/温度高

[单选题]In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.

A. fresh water
B. sea water
C. cooling oil
D. emulsio

[单选题]On the top of the cylinder is mounted the cylinder cover which is pressed onto （） of the cylinder liner by means of nuts and studs.

A. the camshaft
B. the flange
C. the ridge
D. the bulge

[单选题]Please draw out a 01 mm （） between the two halves of the bearing to reduce the clearance.

A. shim
B. gasket
C. washer
D. packing

[单选题]Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?（）

A. Splash lubrication
B. Pressure lubrication
C. Sight feed lubricators
D. Mechanical lubricator

[单选题]An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.

A. decrease in maximum cylinder pressure
B. increase in ignition lag
C. decrease in fuel consumption per horsepower-hour
D. decrease in exhaust manifold pressure

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