题目:
It is said that a new robot ______ by him in a few days. |
A. designed B. has been designed C. will be designed D. will have been designed |
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:A、1mol Fe2+与足量的H2O2溶液反应生成铁离子,转移nA个电子,A不正确;B、标准状况下,22.4L NO2气体中含有2NA个O原子,不存在氧气分子,B不正确;C、常温常压下,15g HCHO的物质的量是15g...