国内有网易公开课、腾讯课堂、百度传课等非常优秀的网课平台，而在国外也有很多非常优秀的在线网课平台，比如：In soaked programs on gasoline/immediate injected engines treatment need to be taken to stop backfires due to gasoline pooling in the ingestion tract or manifold and/or uneven distribution in th