Each cylinder has one starting valve which is usually opened

【名词&注释】

重要原因(important reasons)、符合要求(meet the requirement)

[单选题]Each cylinder has one starting valve which is usually opened by air pressure and closed by （）

A. nuts and bolts
B. new joints
C. spring force
D. sealing ring

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学习资料：

[单选题]劣质渣油中含有（），使用中使烟灰增加且具有粘性，是烟灰发生沉积的重要原因（）。Ⅰ.灰分；Ⅱ.残炭；Ⅲ.硫分

A. 仅Ⅰ对
B. 仅Ⅱ对
C. 仅Ⅲ对
D. Ⅰ+Ⅱ+Ⅲ

[单选题]曲轴的臂距差对应着曲柄的变形，若臂距差小于零，则在水平平面内曲柄呈（）。

A. 塌腰形
B. 拱腰形
C. 左拱形
D. 右拱形

[单选题]当铁梨木艉轴承的轴承间隙和铁梨木板条的厚度均不符合要求，超过极限间隙时，可采用（）方法修理。Ⅰ.更新艉轴承；Ⅱ.更新艉轴铜套；Ⅲ.焊补艉轴铜套；Ⅳ.只换新下瓦；Ⅴ.上、下瓦对调。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C. Ⅰ＋Ⅳ＋Ⅴ
D. Ⅱ＋Ⅲ＋Ⅳ

[单选题]A distance piece, known as a （） may be interposed between the rod and the bearing housing.

A. bearing shell
B. bearing liner
C. compression plate
D. lead wire

[单选题]High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.

A. many thousand times
B. between times
C. one time
D. at time

[单选题]Load control on a diesel engine is accomplished by （）.

A. regulating the speed of the turbocharger
B. rotating the fuel injector pump plunger
C. regulating the speed of the fuel oil transfer pump
D. changing engine timing

[单选题]Poor combustion in a diesel engine can be caused by （）.

A. high compression pressure
B. low intake air temperature
C. low exhaust pressure
D. high scavenge air pressure

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