国产亚洲高清成人无码在线观看_男人天堂av日韩_国产在线精品一区二区夜色还会玩转热点_50岁经典露脸老熟女_美女裸身黄色网站_偷拍日韩AV电影_国产精品嫩草影院永久在_国产精品无码一区二区三级在线_亚洲国产黄片观看_成人免费视频网站www

The water divider is a necessary connecting device for dividing the water flow of the main fire water supply line from several tributaries. Aluminum-silicon alloy is the main material of water divider for fire protection in China, and metal mould casting is the main manufacturing technology. At present, the domestic water dividers are mainly two dividers and three dividers, and the Shanghai Fire Brigade also uses four dividers.