题目

对下列事实解释的方程式错误的是() A . 向悬浊液中加入几滴溶液,沉淀变为红褐色: B . 过氧化钠用作潜水艇中的供氧剂: C . 收集的酸雨过一段时间后pH值会减小: D . 工业上用情性电极电解饱和氯化钠溶液生产氢氧化钠: 答案:B— Excuse me, sir. Is the swimming pool open all day as it used to be? — _____. only from 6:00p.m to 10:00p.m. [     ]A.That's right B.Yes, of course C.Sorry, I'm not sure D.Sorry, I'm afraid not
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