Objective to explore the method of the distal perforator-based gluteus maximus muscle V-Y flap to treat the sacral ulcer and to simplify the operative procedures.
目的探讨应用臀大肌远侧穿支v - Y皮瓣修复骶部褥疮，简化手术操作。
Simplify the axiom system of lattice implication algebras, which was given by y.
给出的格蕴含代数的公理系统，并给出另一个公理系统。
Simplify the axiom system of lattice implication algebras, which was given by y.
给出的格蕴含代数的公理系统，并给出另一个公理系统。
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