久久国产精品电影_亚洲欧美日韩精品久久奇米色影视_国产午夜视频在线观看网站_久久午夜宅男免费网站

Baofeng has a 70 meter long cold drawing equipment, which enables the maximum length of heat exchange tubes to reach 53 meters. Combined with the introduction of bright annealing furnace equipment from South Korea and Japan, the heat exchange tubes have good dimensional tolerance, excellent internal and external surface quality, and good material performance. According to customer requirements, the heat exchange tubes can be cold bent or hot bent into U-shaped tubes, coil processing, etc。