Double step drum is an integral drum with stepwise flanges and double step sections. It allows the multiple layer rope winding in non-operating portion of luffing mechanism to make drum shorter.
双阶梯卷筒是一种带有阶梯法兰盘和双阶梯截面的综合式卷筒，可在变幅机构的非工作区段使钢丝绳多层卷绕，以缩短卷筒长度；
This machine is of LV model, double-row, double-step, double function, water-cooling, and intercrossing, fixed, no basic reciprocating piston type air compressor.
本机为L型、两列、两级、双作用、水冷、有十字头的固定式往复活塞空气压缩机。
This machine V-6/7 is of V model, double-row, double-step, water cooling, fixed reciprocating piston type air compressor.
本机型为V型两列、两级、水冷的固定式往复活塞空气压缩机。
This machine V-3/7 is of V model, double-row, double-step, water cooling, fixed reciprocating piston type air compressor.
本机型为V型、两列、两级、水冷的固定式往复活塞空气压缩机。
This machine VF-6/7 is of V model, double-row, double-step, wind cooling, fixed reciprocating piston type air compressor.
本机型为V型、两列、两级、风冷的固定式往复活塞空气压缩机。
Objective We investigated the feasibility of using computer assisted design in double-step distraction osteogenesis in the reconstruction of mandibular segmental defects after tumor resection.
目的：探讨计算机辅助设计在定向二次牵引成骨术修复一侧下颌骨肿瘤术后缺损中的应用及效果。
Objective We investigated the feasibility of using computer assisted design in double-step distraction osteogenesis in the reconstruction of mandibular segmental defects after tumor resection.
目的：探讨计算机辅助设计在定向二次牵引成骨术修复一侧下颌骨肿瘤术后缺损中的应用及效果。
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