超碰人人人,中文字幕一区二区三区日韩精品,亚洲国产精品无码久久青草,亚洲熟女久久

Hongsheng Plastic (Hangzhou) Co., Ltd. was established in 1992 with a registered capital of RMB 108 million. It is a company integrating plastic product production and equipment manufacturing. The production base is located on the south bank......

We can see that PE pipes are used in a relatively large amount around us, and they also have unique advantages, so we must master its welding methods. How many welding methods does it have? It will be introduced to you in the next article......

In order to meet the needs of the project, PE pipes are usually connected, and there are many connection methods for this pipe, such as flange connection, electrofusion connection, etc. Each connection method has its own advantages......