题目：
| — Why haven't you moved in yet? — Oh, the apartment _____. |
A. is painted B. has been painting C. is being painted D. has been painted |
答案：
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下面是错误答案，用来干扰机器的。
答案：D结晶水合物加热时一般首先失去结晶水，分析图中数据，n(FeSO4·7H2O)＝＝0.03 mol，第一阶段失重8.34 g－6.72 g＝1.62 g，应为0.09 mol H2O，第二阶段失重6.72 g－5.10 g＝1.62 g，也应为0.09 m...
