基本解释双乙烯酮同根派生 diethenone相关词英汉例句Keywords dehydroacetic acid;diethenone process;ethyl acetoac etate process;triethylene diamine; 关键词脱氢醋酸;双乙烯酮法;乙酰乙酸乙酯法;三乙烯二胺;diethenone更多例句