单项选择题
A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.
A.monkey
B.donkey
C.waste heat
D.main
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相关考题
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单项选择题
Between the steam dram and the smaller water dram below, large numbers of smaller diameter （） tubes are fitted.
A.fire
B.water wall
C.generating
D.down comer -
单项选择题
The safety valve should be （） in the presence of C/E and Surveyor.
A.tightened up
B.sealed up
C.opened up
D.unscrewed -
单项选择题
The safety valves are mounted in pairs to （） the boiler against overpressure.
A.use
B.release
C.protect
D.effect
