由于降低PH值会降低垢的形成，所以污水的PH值控制得越低越好。
参考答案：错
电发哲春（）
A．≌ ♂‰∮
B．≌♀ ‰∮
C．≌♂％∮
D．∮≌♂‰
She was happy,（）
A.So are you
B.So you are
C.So you were
D.So were you
