题目:
The conference _____ a full week by the time it ends. |
A. must have lasted B. would have lasted D. has lasted |
答案:
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答案:A题目分析:橙红色晶体A在常温下就有升华现象,是共价化合物,不含钾元素,根据K元素守恒,可知最终收集的KCl为0.02mol,根据质量守恒,可知A的质量=12g+0.02mol×122.5g/mol+0.02mol×254g/mol-8.7g-...