单项选择题
Air reservoirs are designed, built and tested similarly to （）.
A.boiler drums
B.hot wells
C.condensers
D.evaporators
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
Generally speaking, suction heads require to be （） for high speed or large capacities than for low speed or small capacities.
A.greater
B.smaller
C.better
D.worse
