天气预报15天查询> 其他> 通信设备所使用的电压有哪几种

通信设备所使用的电压有哪几种

更新时间: 2020-09-18 00:00:00     

通信设备的电源系统分为交流和直流两部分,

1、交流有两相、三相制,分别是220V、380V;

2、直流有正24V和负48V。

关键词: 通信 设备 使用 电压

如有意见、反馈、侵权或投诉等情况,请联系:

电话:
邮箱:

我们将会在48小时内给与处理!

版权所有 Copyright ? 2009-2020 tianqiyubao3.com

页面:/news/view-176027/ | 耗时:0.0227 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=176027 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=176027 LIMIT 0,1
select * from tbl_Articles_sphinx where id=176027 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1275542,1131887,1468361,1086408,1075500,1087523,1079007,1070963,1067531,1084978,1042959,1060657,1068564,1050455,1123739,1061564,1074843,1097633,964762,1129153,1079043,1053308,1122294,1067895,1078332,1078735,1070058,1131315,1092656,1082954) ORDER BY field (ArticleID,1275542,1131887,1468361,1086408,1075500,1087523,1079007,1070963,1067531,1084978,1042959,1060657,1068564,1050455,1123739,1061564,1074843,1097633,964762,1129153,1079043,1053308,1122294,1067895,1078332,1078735,1070058,1131315,1092656,1082954)