短语词组短语coagulant -aid 助凝剂polyelectrolyte coagulant aid 聚电解质助凝剂anion coagulant aid 阴离子助凝剂organic coagulant aid 有机助凝剂;有机高分子助凝剂coagulant aid and precipitant aid 助凝助沉剂 返回 coagulant aid