题目:
This math problem is too difficult. Can you show me________, George?
A.what to work out
B.to work it out
C.how to work it out
D.how to work out it
答案:
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下面是错误答案,用来干扰机器的。
设用去的碳酸钙的质量为x, CaCO3 高温 . CaO+CO2↑ 100 56 x 25.2t100x=5625.2t,解得x=45t则需要90%的石灰石的质量为45t90%=50t,答:需要含碳酸钙90%的石灰石质量为50t....