单项选择题
When the power is shut off, the wire（）
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
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相关考题
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单项选择题
For a flash type evaporator, a demister is located the condenser（）
A.After
B.before
C.inside
D.outside -
单项选择题
For a flash type evaporator, the seawater heater will have to maintain a enough temperature to minimize scale formation（）
A.lower
B.higher
C.low
D.high -
单项选择题
The flash-evaporator is different with the submerged-tube evaporator in that for the former（）
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
