91精品视频观看|亚洲免费精品AⅤ国产|亚洲欧美日韩高清在线看|国产日本在线一区二区播放|久久免费看黄A级毛片男男|精品国产一区二区三区无码|欧美精品一区二区三区 高清|国产日韩欧美一区二区在线观看

　　 注：(1)B132為增音機輸出與輸入端之間要求的串音衰減，一般按下式計算：

     　　                                        B132 = (50+S)dB或B132 =(5.8+S)Np��

　　     (2)在其它平行接近線路上裝設縱向扼流線圈后允許的間距x一般按下式計算：　　   

                                                   線擔，x1=0.72x

上一頁 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] 下一頁