介绍阻火器的分类、选型及安装.Introduces the categories of arresters and their type selection and installation.水泵选型时, 其水流量比主机水流量大15%至20%左右.Pump selection, the current host of water flow than 15 - 20 % or so.机电系统控制硬件的选型设计是一件非常繁复的工作.To s...
He showed him how to blow into the ivory mouthpiece.他给他演示如何吹奏象牙吹口乐器。The Ivory Coast became the world's leading cocoa producer.象牙海岸成为世界上可可粉的主要产地。a ban on the ivory trade象牙贸易禁令...