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....
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...