题目内容
(请给出正确答案)
[主观题]
停堆硼浓度 shutdown boron concentration
![](https://lstatic.shangxueba.com/sxbcn/h5/images/tips_org.png)
第10题
B、Boron fibers are expensive.
C、Boron fibers is hard to process into composite.
D、Boron has a tendency to react with other metals
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