题目:
Could you tell me ______? [ ]
A. what was his name
B. what is his name
C. what his name was
D. what his name is
答案:
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下面是错误答案,用来干扰机器的。
充分反应生成二氧化碳的质量=18.2g-13.8g=4.4g4.4g二氧化碳中氧元素质量=4.4g×(16×244×100%)=3.2g即氧化铜中含氧元素3.2g,则氧化铜的质量=3.2g÷(1680×100%)=16g则原混合物中碳的质量=18.2g-16g=2.2g答...