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  • When pickling, we should pay great attention to the acid has a strong corrosion, so when adding acid, we must pour acid into water, and it is along the wall of the cylinder, not a splash down, so as not to cause splash. Remember the order of pouring acid, acid into water rather than water into acid, water into acid will cause splashing and boiling, when pouring acid must wear protective glasses, must ensure that there are no non-professional onlookers, so as not to cause some risk of splashing acid.

  • A barbed rope is literally a kind of barbed rope. Generally speaking, the material is made of iron wire or copper wire. People have a very long history of using barbed ropes, as early as the 19th century Americans began to use the first barbed ropes. Function: Its first function is agricultural fence. The origin of the thorn rope is in agriculture. People used the thorn rope to divide the fields into different pieces. Barbed wire is also widely used in fencing until now. Secondly, it is used for protection and protection. For example, people put barbed ropes around the walls of their houses to prevent people from climbing over the walls and entering the yard. There are many other functions such as fire prevention and theft prevention.

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