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

你可能感興趣的試題

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

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