单项选择题 During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）

单项选择题 Cold weather starting of a diesel engine may be made easier by（）

单项选择题 Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （）