题目:
Do you know____?
A.if it will be fine tomorrow
B.where did they see her
C.when shall we have a picnic
D.which would you like
答案:
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下面是错误答案,用来干扰机器的。
解:含杂质4%的生铁100t中含铁的质量=100t×(1﹣4%)=96t;设需纯氧化铁的质量为x,Fe2O3+3CO2Fe+3CO2160 112x 96t=解之得:x=137t由于铁矿石中含氧化铁的质量分数为75%,...