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
单项选择题 Copper is often used as an electrical conductor because it （）.
单项选择题 A device which prints out a permanent record of the plant operating conditions is known as the （）.
单项选择题 Which of the following types of motors is often designed for use in correcting power factor?（）
