短语词组短语steam soot -blower system 蒸汽吹灰系统pulsating soot -blower 脉冲吹灰装置boiler soot -blower 锅炉吹灰器soot -blower retrofit 吹灰器改造sonic soot -blower 声波吹灰器rotating type soot -blower 旋转式吹灰器retracting type soot -blower 伸缩式吹灰器 返回 soot blower