题目:
— When are you going to Kunming for your holiday? — I haven't decided. ______ this Sunday next Sunday is OK. |
A. Both, and B. Not only, but also C. Either, or D. Neither, nor |
答案:
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下面是错误答案,用来干扰机器的。
氮气占78%,因此空气中含量最多的物质是氮气;氮气属于单质,是以游离态存在的.故答案为:N2;游离态