The utility model has the advantages that the utility model can fit a large rang of wind velocity changes and make full use of the wind energy.

它具有能适应较大风速变化范围，能充分利用风能的优点。

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With preoperative cervical sequence changes, high-stress position (C2 or C7) and small joint involved, the postoperative cervical alignment and rang of motion may be affected.

当椎板切除术累及高应力部位(颈2或颈7)，术前存在颈椎序列变化，小关节受累等可能影响术后颈椎曲度与活动度。

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With preoperative cervical sequence changes, high-stress position (C2 or C7) and small joint involved, the postoperative cervical alignment and rang of motion may be affected.

当椎板切除术累及高应力部位(颈2或颈7)，术前存在颈椎序列变化，小关节受累等可能影响术后颈椎曲度与活动度。

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