GD-J series high-vacuum flap valve is used to cut off or connect air stream in vacuum system.

GD - J系列高真空挡板阀是用于真空系统中用来切断或接通气流之用。

youdao

Zhang YX, Xia RY, Yu GQ, et al. Grafting of radius periosteum flap pedicled with fascia and vessel in treatment of old scaphoid fracture. Chin J Orthop Trauma, 2004, 6:708-709.

张炎祥，夏仁云，余国庆，等。带筋膜血管蒂桡骨骨膜骨瓣移植治疗陈旧性舟骨骨折。中华创伤骨科杂志，2004,6：708 - 709。

youdao