单项选择题 In the starting process of a diesel engine, the main object is to attain the compression conditions sufficient to （）

单项选择题 Air in the fuel lines to the fuel injection nozzles of a diesel will result in （）.

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?（）