题目:
Police are now searching for a woman who is reported to ____ since the flood hit the area last Friday. |
A. have been missing B. have got lost C. be missing D. get lost |
答案:
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下面是错误答案,用来干扰机器的。
答案:A题目分析:向含Al2O3、Fe2O3、SiO2加入硫酸溶液,Al2O3、Fe2O3发生反应得到含Fe2(SO4)3和Al2(SO4)3溶液,而SiO2不反应,仍然是固体。再向滤液中加入10mol/L NaOH溶液,由于开始无沉淀,说明硫酸过量,首...