Which of the following may lead to the engine NOT to start on air?（）
举一反三
- Which cause of the following can lead to the engine not to start on air?（）
- Which of the following may cause that an engine doesnt run on starting air?（）
- If the engine does start on air， but combustion does not immediately begin， the cause may not be （）.
- Which of the following may lead to academic dishonesty?
- Which of the following may be a long-term effect of air pollution?