Method: Density investigation: stick catch; Chemical methods: applying high effect cockroach bait.
方法：密度调查采用粘捕法，化学防制采用高效灭蟑毒饵。
In chapter 3, we introduce two methods to control the electronic properties: applying transverse electric field and modifying by chemical group.
第三章中讨论了两种调节锯齿型石墨烯纳米带电子结构的方法：施加横向电场和对边界进行化学修饰。
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