单项选择题
A.that the transmitter is on the bridge B.that local manual control can be achieved C.that remote control can be achieved D.simple in construction and reliable in operation
The spur geared mooring winches have advantages over wo...
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
In an automatic mooring winches, the wire is paid off t...
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.
A.lower；igher B.maximum；higher C.predetermined minimum；higher D.predetermined maximum；lower
When the power is shut off, the wire（）A.becomes slackB....
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
