矿井中的电气信号应能同时发声和发光。重要信号装置附近,应标明信号的种类和用途
正确
暂无解析
There'snodoubtthatthisisnottheway____Icamelasttime.
Youneedtospendplentyoftimesearchingforjobsandtreatit____itisajobitself.
______theyaretwinsisters,theydon’tlooklikeeachother.
Hetalkedaboutthemenandbooks____interestedhimgreatlyintheschool.
Thereason____(为什么这事情会这样)isnowclear.Idon'tneedtoexplainitoncemore.