正确答案: B

小的烟垢着火

题目：废气锅炉烟道温度在300—400℃时可能发生（）。

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学习资料的答案和解析：

[单选题]甲板机械是为保证（）的机械设备。

A+B

[单选题]增压四冲程柴油机当停增压器运转时，可做的调整工作是（）。

适当增大气阀间隙

[单选题]Before pumping up the crankcase oil,（） should be worked by hand to minimize corrosive action on the liners.

the cylinder lubricators

[单选题]The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.

the cross-head

[单选题]In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.

expansion tank atmospheric vent

[单选题]The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.

hydraulic “push rods”