If the engine （） for a long period, there will be a danger

【名词&注释】

边界层(boundary layer)、锅炉管

[单选题]If the engine （） for a long period, there will be a danger of frost.

A. must to stand inoperative
B. has to stand inoperative
C. must be stood idle
D. will stand idle

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[单选题]废气锅炉烟道温度在1100℃以上时可能发生（）。

A. 小的烟垢着火
B. 锅炉爆炸
C. 铸铁着火
D. 氢着火

[单选题]应保持锅炉管表面边界层的废气温度（）烟灰着火温度，减少烟垢着火的危险。Ⅰ.低于；Ⅱ.等于；Ⅲ.高于

A. 仅Ⅰ对
B. 仅Ⅱ对
C. 仅Ⅲ对
D. Ⅰ，Ⅱ，Ⅲ都不对

[单选题]（） the engines, the diesel engine is（） used engine on board.

A. Between；more commonly
B. Among；the most commonly
C. Between；not more commonly
D. Among；not the most commonly

[单选题]Since the engine doesn’t work well, you’d better （） as soon as possible.

A. reduce its speed
B. find out its trouble
C. eliminate its trouble
D. all the above

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