发动机连续起动次数越多其机动性越好，对每台可换向的主机在冷机

【名词&注释】

发动机、机动性(mobility)

[单选题]发动机连续起动次数越多其机动性越好，对每台可换向的主机在冷机条件下应不少于（）次。

A. 3
B. 6
C. 12
D. 15

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学习资料：

[单选题]A common trouble with the fuel pump plungers or fuel valve spindle is （）.

A. broken down
B. stuck
C. oil leakage
D. carbonized

[单选题]The pump has a constant stroke and the amount of fuel delivered is regulated by rotating （） which has a specially arranged helical groove cut into it.

A. the pump cylinder
B. the pump cam
C. the pump plunger
D. the pump miler

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