工业上常用Fe作电极电解处理含Cr2的酸性废水,最终使铬元素以Cr(OH)3沉淀的形式除去。某科研小组用该原理处理污水,设计装置如图所示。下列说法一定不正确的是( )
Charles was alone at home, with_______ looking after him.
It is often ______ that human beings are naturally equipped to speak.
I can’t leave. She told me that I ______ stay here until she comes back.
—— Do you mind my opening the window? It’s a bit hot in here. —— ______ , as a matter of fact
It’s high time you had your hair cut ; it’s getting _______ .