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
                    
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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
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                                    单项选择题
                                    
A device which prints out a permanent record of the plant operating conditions is known as the ().
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Which of the following types of motors is often designed for use in correcting power factor?()
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B.Wound-rotor
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