Based on the Back-to-Back Project for the Northwest and Central China Connection, This report studies the harmonics and ac filter at ac side in the HVDC converter station.

本论文以西北—华中联网背靠背直流换流站工程为基础，进行换流站交流侧谐波和交流滤波器的研究。

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For many college students, back to school also means back to downloading music over the university's high-speed Internet connection.

对于许多大学生来说，回到学校就意味着可以重新通过学校的高速因特网下载音乐了。

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For many college students, back to school also means back to downloading music over the university's high-speed Internet connection.

对于许多大学生来说，回到学校就意味着可以重新通过学校的高速因特网下载音乐了。

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