单项选择题
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（）.
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）（）.