Ecological reactive powder concrete(ECO-RPC)was prepared by replacing 60% of cement with ultra-fine industrial waste powders and replacing ground fine quartz sands with natural sands.
用超细工业废渣取代60%的水泥，用普通黄砂取代磨细石英砂制备生态型RPC材料。
Resonant frequency can be changed by loading the antenna with a reactive tuning component, which can be placed between the antenna element and the ground plane.
共振频率可以改变被动的加载与调谐组件，它可与天线单元和接地层放置天线。
Resonant frequency can be changed by loading the antenna with a reactive tuning component, which can be placed between the antenna element and the ground plane.
共振频率可以改变被动的加载与调谐组件，它可与天线单元和接地层放置天线。
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