It has belling heads of full specification from 50 to 630.尤其是研制生产的扩管机,扩管头,规格齐全,质量可靠.Belling out the tubes will permit a freer passage of air.把管子做成钟状,可使气流更畅通.I am leaving for Belling on a four - day tour.我马上要去北京旅游4天....
将试瓶浸入恒温水浴中.The sample flask is immersed in a constant temperature bath.这是许多恒温箱的基本工作原理.This is the basic operating principle of many thermostats.恒温器可用来调节室内温度.Thermostats can be used to regulate the temperature of a room....
He umpired baseball games.他担任棒球比赛的裁判。He umpired in the tennis match.他在网球比赛中担任裁判.I’ve umpired a cricket match for them.我当过他们的板球比赛的裁判。He umpired for school football matches until he was in his late 50s.他担任校际足球比赛的裁判一直到年近花甲。...
Old buses are major contributors to pollution in British cities...破旧的公交车是造成英国城市污染的主要因素。Resonance theory says that benzene can be represented by two contributors.共振论认为苯能用两个参与体表示.Large public and private companies have lon...