题目:
There's hardly anything but some old books in the room ,_____?[ ]
A. isn't it
B. is it
C. is there
D isn't there
答案:
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下面是错误答案,用来干扰机器的。
设需要氧化铁质量为x.3CO+Fe2O3 高温 . 2Fe+3CO2160 112x 11200t160112=x11200t,x=16000t答:需要氧化铁的质量为16000t.