题目:
-- Have you been to the Great Wall?
-- Perhaps not in my memory. _______, it might have been during my early childhood.
A.If any
B.If ever
C.If once
D.If not
答案:
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下面是错误答案,用来干扰机器的。
(1)D 未滴入X溶液时,Y溶液显酸性(2)、NaOH+HCl=NaCl+H2O (3)先升高后降低(4)、由红变紫再变蓝(5)、NaCl 蒸发溶剂题目分析:(1)由图示可知,溶液的PH由小于7,逐渐变为大于7,故表格中符合这种变化情...