[单选题]废气锅炉烟道温度在1100℃以上时可能发生（）。

正确答案 ：C

铸铁着火

[单选题]Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.

正确答案 ：C

compressed air

[单选题]During repair,lubrication lines and orifices must be （）.

正确答案 ：D

sealed off

[单选题]During working, when the piston is near the （）, the air ignites the fine spray of fuel.

正确答案 ：A

TDC

[单选题]The quantity of oil injected into the cylinder can be regulated （）.

正确答案 ：A

by turning the pump plunger

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