正确答案: D

the turning gear still engaged

题目：If the engine does start on air, but combustion does not immediately begin, the cause may be _____.

解析：D

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举一反三的答案和解析：

[单选题]《符合证明》的有效性服从于由主管机关认可的机构执行____。

年度审核

[单选题]Which of the following is NOT mentioned in this passage?

Bursting caps must be fitted

[单选题]Usually, emergency electricity supplies to_______on board

Steering gear

[单选题]正常成年人收缩压为______。

90～140mmHg

[单选题]A crack in a cylinder liner can be caused by

restricted cooling water passages