单项选择题
A.circuit breaker B.amplifier C.diode D.capacitor
Routine maintenance of lead acid batteries should inclu...
单项选择题Routine maintenance of lead acid batteries should include （）.
A.keeping the terminals clean B.coating cable connections with petroleum jelly C.maintaining a trickle charge D.All of the above
Under which of the listed conditions can the engine roo...
单项选择题Under which of the listed conditions can the engine room retake the throttle control from the bridge（）.
A.Any time it is deemed necessary B.Only with the masters permission C.After a 10 minute delay to the input command D.Only after the throttle has been placed in stop
Copper is often used as an electrical conductor because...
单项选择题Copper is often used as an electrical conductor because it （）.
A.has high resistance at low temperatures B.has a highly polished surface C.is able to pass current with little opposition D.holds insulation together well
