单项选择题
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
单项选择题 In an automatic mooring winches, the wire is paid off the barrel at（） a tension and is recovered at（）tension.
单项选择题 When the power is shut off, the wire（）
单项选择题 For a flash type evaporator, a demister is located the condenser（）
