导致生物接触氧化池初期投资高的主要原因是（）
A.鼓风机
B.填料
C.停留时间
D.负荷率
参考答案：B
小败毒膏
A．微波干燥养护法B．远红外加热干燥养护法C．蒸汽加热养护技术D．气体灭菌养护技术E．辐射灭菌养护技术
Jack thinks English is more interesting than math.
A．Jack thinks math is less interesting than English.
B．Jack thinks math is much interesting than English.
C．Jack thinks English is as interesting as math
D．Jack thinks English is much interesting as math
