单项选择题
A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an （）
A.torque limiter B.over-speed trip C.over-speed governor D.load limit governor
单项选择题 Black smoke exhausting from an operating diesel engine can be caused by （）
单项选择题 White smoke exhausting from a diesel engine can be caused by a （）
单项选择题 White smoke exhausting from a diesel engine can be caused by （）
