Barron sat英语物理题

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Barron sat英语物理题
If graphite is used in a nuclear reactor,its function is to___.slow down neutrons.可是石墨不是通过吸收中子来减速的吗?为什么不选B.absorb neutrons呢?

不能选B 因为吸收中子是原理,但是人家问的是 function 就是起到了什么效用,也就是吸收中子的结果,slow down neutrons C
如果还有问题可以找我~

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