As a heat engine,（） energy is the source of power by which

【名词&注释】

柴油机连杆(diesel engine connecting rod)、四冲程柴油机(four-stroke diesel engine)

[单选题]As a heat engine,（） energy is the source of power by which the diesel engine can be operated.

A. electric
B. heat
C. mechanical
D. exhaust

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学习资料：

[单选题]四冲程柴油机连杆螺栓伸长量超过原设计长度的（）时应报废换新。

A. 0.5%
B. 1%
C. 1.5%
D. 2%

[单选题]The bed-plate is secured in the longitudinal direction by means of bolts known as （）.

A. end-chock bolts
B. side-chock bolts
C. through bolts
D. tie rod

[单选题]Turbocharging system may be designed to operate on either the （） or the constant pressure exhaust system.

A. pulse
B. exhaust
C. fluctuating
D. hunting

[单选题]The crankcases of many diesel engines are kept under a slight vacuum to （）

A. improve fuel economy
B. increase the air charge velocity
C. reduce the risk of explosion
D. all of the above

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