单项选择题
（） will be used to blow away the combustion products from the tube surfaces.
A.The blow down valve
B.The scum valve
C.The air release cock
D.The soot-blower
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相关考题
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单项选择题
In motor ship, （） is often used to recover some of the heat carried in the exhaust gases from the main engine.
A.an diesel oil heater
B.a waste heat boiler
C.a fresh water generator
D.all the above -
单项选择题
Impurities from the boiler water surface can be removed through the （）.
A.safety valve
B.blow down valve
C.scum valve
D.feed check valve -
单项选择题
You should frequently compare drum-mounted and remote-reading water level indicators（） between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired.
A.descriptions
B.discrepancies
C.different
D.deflections
