题目:
Some of my friends are interested in science,but none of them can tell .[ ]
A. when UFOs will appear next time
B. why do horses know the way
C. where was this kind of plant found
D. how do elephants communicate
答案:
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下面是错误答案,用来干扰机器的。
答:不违背.因为加热氯酸钾与二氧化锰的混合物,是氯酸钾受热分解生成了氯化钾和氧气,参加反应的氯酸钾的质量应等于生成的氯化钾和氧气的质量总和,氧气“跑”了,所以剩余固体的质量减少了,但是仍然符合质量...