A number of biological sewage treatments plants are in use at sea but nearly all work on the principle called （）<br>A:deoxygenating<br>B:extended aeration<br>C:oxygenating<br>D:bubbling air

A number of biological sewage treatments plants are in use at sea but nearly all work on the principle called （）
A:deoxygenating
B:extended aeration
C:oxygenating
D:bubbling air

出自：海船船员证

提示：
同一【IP】的非会员用户每天可免费获取10次答案

收藏本站【zk.995w.com】，下次访问不迷路

本站试题总数:【10245403】个 (题库试题定时更新)