A diesel engine may be hard to start if the （）
举一反三
- As for a diesel engine， lack of combustion air may be due to （）.
- If a diesel engine is difficult to start and operates with the engine temperatures lower than normal， you should suspect that the （）.
- Which of the following may lead to the engine NOT to start on air?（）
- If the engine does start on air， but combustion does not immediately begin， the cause may not be （）.
- Diesel engine air start system check valves are opened by （） A: an air start cam B: cylinder compression pressure C: starting air pressure D: valve spring