單項(xiàng)選擇題

The defective place in the furnace should be （） with fire bricks.

A.paved
B.cleaned
C.welded
D.dismantled

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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