与一生成树相关的基本圈是广义圈子空间的一个基底。
The fundamental circuits relative to a spanning tree is a basis of the circ subspace .
方法：对18例基底动脉瘤患者采用电解可脱性微弹簧圈栓塞的临床资料进行回顾性分析。
Objective: To summary the clinic effect of 18 cases of basilar artery aneurysm treated by embolization of guglielmi detachable coil.
结论：电解可脱性微弹簧圈血管内栓塞治疗基底动脉动脉瘤是较为安全有效的方法。
Conclusions: Guglielmi detachable coil occlusions is a safe and effective method for treatment of basilar artery aneurysm.
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