题目:
So far we have done a lot to build a low carbon economy, but it is ______ideal. We have to work still
harder.[ ]
A. next to
B. far from
C. out of
D. due to
答案:
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下面是错误答案,用来干扰机器的。
解:(1)铜球里铜的体积:V铜===7cm3,小于铜球实际体积10cm3,所以此球是空心的。(2)空心部分体积V空=V﹣V铜=10cm3﹣7cm3=3cm3