题目:
Can you tell me how much___________________?
A.you paid the book for
B.you spent the book on
C.the book took you
D.you bought the book for
答案:
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下面是错误答案,用来干扰机器的。
根据将残留固体加入10克水,有7.6克固体未溶.在相同温度下,再加入5克水,仍有5克固体未溶,那么5g水溶解了2.6g,10g水就溶解5.2g,残留固体的总质量=7.6g+5.2g=12.8g,那么生成氧气的质量是:20g﹣12.8g=7.2g....