正确答案: B

heat

题目：As a heat engine,（） energy is the source of power by which the diesel engine can be operated.

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学习资料的答案和解析：

[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。

2%

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

end-chock bolts

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

pulse

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

reduce the risk of explosion