偏心阀板蝶阀
offset disc eccentric butterfly valve
offset disc burerfly valve
eccentric butterfly valve
eccentric butterfly Valve
offset disc burerfly valve
双板对夹式止回阀
dual plate wafer type check valve
热风阀阀板的节能探讨
Energy saving on valve plate of hot blast valve
对（对二甲胺苯偶氮）苯磺酸钠[盐]
p-(p-dimethylaminophenyl-azo)benzenesulfonic acid sodium salt
methyl orange
不等厚板对接焊缝
butt weld with unequal thickness plates
不燃轻质对板墙
unburnting lightweight double leaf wall