单项选择题
A.Date and description of each failure B.Average load in pounds for each usage C.Total number of lifts for each usage D.All of the above
The item（）is not the advantage of the hydraulic winch．A...
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
Sudden starts or stops of the boom is likely to cause a...
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
Running an electric winch at slow speed over a long per...
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
