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单项选择题
A.a sewage treatment plant
B.the extended aeration process
C.the liquor
D.the bubbling air
单项选择题
A.in boiler drums
B.in refrigerating plants
C.in starting air pipes
D.in air coolers
单项选择题
A.boiler drums
B.hot wells
C.condensers
D.evaporators
单项选择题
A.high pressure alarm
B.fire alarm
C.extinguishers
D.fusible plugs
单项选择题
A.filled
B.evacuated
C.compressed
D.charged
单项选择题
A.greater
B.smaller
C.better
D.worse
单项选择题
A.hydraulic head
B.static head
C.heat energy
D.steam
单项选择题
A.a liquid
B.a pressure
C.a temperature
D.none of the above
单项选择题
A.a priming device
B.a discharge branch
C.a filter
D.a suction valve
单项选择题
A.pump
B.engine
C.turbine
D.boiler