单项选择题X 纠错
A.rotary compressors
B.reciprocating compressors
C.centrifugal compressors
D.screw compressors
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单项选择题
A.starting diesel engines
B.pneumatic control systems
C.pneumatic tools
D.supercharging air
单项选择题
A.globe valves
B.butterfly valves
C.gate valves
D.reducing valves
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