OK, see, if you are blanking and don't remember the signs, then you can just draw this picture and make sure that you get it right.
这么看来，如果记不住负号的话，可以画个图再确认一下。
New method of chemistry container connecting leg blanking was introduced, and got exact unfold picture by computer. The method is fast, exact and dependable.
介绍了化工容器连接管下料的新方法，借助于计算机得到精确的展开图，该法快捷方便，精确可靠。
New method of chemistry container connecting leg blanking was introduced, and got exact unfold picture by computer. The method is fast, exact and dependable.
介绍了化工容器连接管下料的新方法，借助于计算机得到精确的展开图，该法快捷方便，精确可靠。
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