偏心阀板蝶阀
offset disc eccentric butterfly valve
offset disc burerfly valve; eccentric butterfly valve
offset disc burerfly valve
eccentric butterfly 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