單項(xiàng)選擇題The spur geared mooring winches have advantages over worm geared ones in()

A.higher efficiency of the gear train while reversing
B.the higher gear ratio
C.the multi-start feature
D.higher recovering speed


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1.單項(xiàng)選擇題In an automatic mooring winches, the wire is paid off the barrel at() a tension and is recovered at()tension.

A.lower;igher
B.maximum;higher
C.predetermined minimum;higher
D.predetermined maximum;lower

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題For a flash type evaporator, a demister is located the condenser()

A.After
B.before
C.inside
D.outside

5.單項(xiàng)選擇題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