From the point of view of relative level, this paper proposes a novel approach for the multilevel compression in Walsh code-division multiplexing digital communication.
本文从相对电平的观点出发，提出了一种沃尔什码分多路信号多电平压缩的新方法。
The multilevel control approach is a two-stage controller design.
多级控制是一种两步控制器设计方法。
Objective:To investigate the surgical approach and indication of total sacrectomy for primary multilevel malignant sacral tumors.
目的：探讨对骶骨多节段恶性肿瘤施行全骶骨切除术的手术入路、手术方式及适应证。
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