单项选择题

The item（）is not the advantage of the hydraulic winch．

A.less jerky starts
B.less jerky stops
C.overheating worries
D.none of the overheating worries

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单项选择题

Sudden starts or stops of the boom is likely to cause all of the following except（）.

A.breaking a cargo runner
B.parting guys topping lifts
C.carrying away a block
D.overheating the resistors and eventually burning out

单项选择题

Running an electric winch at slow speed over a long period of time causes（）.

A.the speed to be retarded by the friction brake
B.a load to go downward at full speed
C.the circuit breaker to turn off
D.the resistors to overheat and eventually burn out