直流输电系统主要有2种运行方式：单极运行方式和双极运行方式。
There are 2 operation modes for DC transmission system:single pole operation and double-pole operation.
行双极人工股骨头置换术者患肢功能的优良率为93.8%（15 / 16例）。
The hip function of bipolar prosthetic replacement treatment was excellent to good in 93.8%(15/16).
行双极人工股骨头置换术者患肢功能的优良率为93.8%（15 / 16例）。
The hip function of bipolar prosthetic replacement treatment was excellent to good in 93.8%(15/16).
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