正确答案: C

spring force

题目：Each cylinder has one starting valve which is usually opened by air pressure and closed by （）

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学习资料的答案和解析：

[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

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（）。

左拱形

[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。

Ⅰ＋Ⅳ＋Ⅴ

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

compression plate

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

many thousand times

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

rotating the fuel injector pump plunger

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

low intake air temperature