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單項(xiàng)選擇題

Air reservoirs are designed, built and tested similarly to （）.

A.boiler drums
B.hot wells
C.condensers
D.evaporators

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單項(xiàng)選擇題

The air reservoirs must have （） fitted to prevent rupture in the event of fire.

A.high pressure alarm
B.fire alarm
C.extinguishers
D.fusible plugs

單項(xiàng)選擇題

Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.

A.filled
B.evacuated
C.compressed
D.charged

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