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
单项选择题 Regulations concerning the stowage，lashing，and securing of timber deck cargoes aboard general cargo vessels may be found in the（）.
单项选择题 Pedestal cranes have limit switches to restrict movement of which function（s）（）.
单项选择题 On no account（）to be exceeded.
