A.lower；igher
B.maximum；higher
C.predetermined minimum；higher
D.predetermined maximum；lower
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A.becomes slack
B.can not be paid out unless the brake is overhauled or recover wire unless manually operated
C.will be let out because the brake is out of work
D.may be pay out due to no power
A.After
B.before
C.inside
D.outside
A.lower
B.higher
C.low
D.high
A.Water is heated into vapor on heating surfaces
B.Water is vaporized by pressure difference
C.There are no heating-transfer surfaces
D.There are more heating-transfer surfaces
A.high-pressure steam-driven air-ejector
B.motor-driven vacuum pump
C.water-motivated air eductor
D.centrifuge pump
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