methylurean.甲脲methyln.甲基；木精methyl tetrahydrofolate甲基四氢叶酸methylmercury hydroxide羟基甲汞(杀菌药)methylbenzylb hydrazine甲基苄肼methyldeoxydenylic acid甲基脱氧甙酸methylphenylethyl ether甲基苯乙基醚methylacetoacetyl group甲基乙酰乙酰基methylene bisacrylamide亚甲基双丙烯酰胺methylene dithiocyanate二硫氰基甲烷methyl isobutyl carbind甲基异丁基甲醇Methylotrophie bacteria甲基营养菌