lower-voltageCOCA²⁸⁰¹³⁶⁺⁵ 基本例句 🌏低压 Characteristics of lower-voltage powerline channel are analyzed in detail, including noise, attenuation, impedance and time varying, providing reference for the designing of communication system. 详细分析了低压电力线信道特性,包括噪声特性、衰减特性、阻抗特性以及时变特性,为系统设计提供依据。 cnki