特种作业人员必须经专门的安全技术培训并考核合格,取得()后,方可上岗作业
D
暂无解析
-___________lateforthemeetingnexttime.—Sorry,Iwon’t.
日常生活中白糖、冰糖和红糖的主要成分是()
下列物质属于纯净物的是()
-WheredidyougolastSunday?
-Wewenttothebeach,andwehadgreatfun_______volleyball.
-I'mafraidacaristooexpensiveforme.
-ButmoreandmoreChinesecan_______tobuyone.