Please pass me the dictionary _____ cover is black.
Please pass me the dictionary \_\_\_\__ cover is black.
black
_____, a friend of Mrs. Black found the watch she had lost two days before.
\_\_\_\__, a friend of Mrs. Black found the watch she had lost two days before.
光波导模式 : 偏振、耦合与对称 : polarization, coupling and symmetry.pdf
本书在简要介绍传统导波光学内容的基础上，重点以光波导弱导微扰理论和群论作为理论分析手段，对单模和少模光波导，特别是单芯和多芯光纤的波导模式结构和分类进行了系统的介绍，并讨论了模式对称性分析方法对周期结构、非线性波导和光子晶体等复杂波导结构的应用。