无码高清视频|成人自拍视频|欧美成人午夜无码A片秀色直播|草美女视频网站|美女被操网站在线观看

<dl id="kjfam"></dl><pre id="kjfam"><legend id="kjfam"></legend></pre>

單項選擇題

Bacteria which live are said to be aerobic（）

A.in the presence of oxygen
B.without oxygen
C.in the presence of nutrition
D.without nutrition

你可能感興趣的試題

單項選擇題

It is that reduce the BOD by converting the organic content of the sewage to a chemically and organically inert sludge（）

A.the bacteria
B.oxygen
C.oxidizing function
D.agitation function

單項選擇題

The basic process of biological sewage treatment consists of the liquor either by bubbling air through it or by agitating the surface（）

A.oxygenating
B.oxidizing
C.deoxygenating
D.proportioning

<ruby id="4tnhf"><output id="4tnhf"></output></ruby>