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單項(xiàng)選擇題

The furnace of an oil fired boiler should be （） before the operating burner is lit.

A.filled with water
B.purged
C.cleared of air
D.None of the above is true

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單項(xiàng)選擇題

（） are mounted in pairs to protect the boiler against overpressure.

A.Safety valves
B.Water tubes
C.Steam stop valves
D.Blow down valves

單項(xiàng)選擇題

In a （） boiler the hot gases from the furnace pass through the tubes while the water is on the outside.

A.water-tube
B.fire-tube
C.exhaust gas
D.None of the above is true

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