题目内容：
Elias Towe pointed out that having no“band gap”，the dispensable feature of transistors，makes it more difficult to produce graphene transistors．
参考答案：
答案解析：
单选题：Elias Towe pointed out that having no“band gap”，the dispens
- 题目分类：英语四级
- 题目类型：单选题
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