[问答题] 简述锚头鱼蚤病的流行情况。

盲井是指没有直通地面的出口，担负提升人员、矿石任务的垂直巷道。 污泥浓缩罐中存在（）个区域。 ["3","1","2","4"] 在PowerPoint 2003中，若要插入在另一个演示文稿中的幻灯片，应该用命令（）。 ["“插入”→“对象”","“插入”→“幻灯片（从文件）”","“插入”→“幻灯片（从大纲）”","“插入”→“新幻灯片&rdquo"] 污泥浓缩的目的在于缩小污泥的体积，以（）混凝剂的投加量与脱水设备。 ["减小","增大","保护","维护"] Water allowed to accumulate in the hydraulic system oil will cause an oxidation process producing by- products which are normally （）. ["gums, acids, and varnishes","removed by cellulose type filters","neutralized by oil additives","not removed by absorbent filter"] 简述锚头鱼蚤病的流行情况。