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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
单项选择题
A.lubricating oil
B.lubricating oil systems
C.strainers
D.cartridges
单项选择题
A.installations
B.basket strainers
C.a cylindrical container
D.a metal or wire basket
单项选择题
A.dampers
B.filters
C.stopper circuits
D.separators