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
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相关考题
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单项选择题
The defective place in the furnace should be （） with fire bricks.
A.paved
B.cleaned
C.welded
D.dismantled -
单项选择题
The exhaust boilers are used to recover some of （） carried in the exhaust gas from the main engine.
A.water
B.oil
C.heat
D.steam -
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
