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采暖双立管工程安装中,会有不少的抱弯安装和制作。弯制抱弯通常采用手工灌砂热煨弯法,这种弯制
Heating double riser project installation, there will be a lot of bending installation and production. Bending Baoguang usually manual filling sand heat simmer bending method, this bending system