结论双向交替牵引手法配合低频电刺激是更为有效的治疗椎动脉型颈椎病的方法。
Conclusion the bidirectional alternate traction manipulation plus low frequency electric stimulation are effective in the treatment of the vertebral-artery-type cervical spondylosis.
设计的气动双向中包装袋机和装箱自动分配机可与20卷自动装药机配合使用，使系统生产效率提高一倍以上。
The designed two-way pneumatic sack packer and boxing automatic distributor can work with the 20 volumes automatic charging machine, improving the productivity more than doubled.
双向推力球轴承，其中圈与轴配合。
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