发布时间:2025-01-21 04:45:45
首先将右下角的按钮FM/TV按一下,让收音机工作在调频(FM)状态,拉开天线,该收音机调谐范围是76~108MHz;
让调谐指针从下面76M开始慢慢往上调,因电视伴音4频道(CH4)频率是83.75,5频道伴音频率是91.75,所以在考试现场搜索区域在CH4~CH5之间寻找88.2MHZ信号。
如果收音机是数显或电调的要方便许多。
hdpe双壁波纹管壁厚,比如说300mm、500mm的管壁厚,能不能给我传个各种型号管壁厚表,急用谢谢了
2025-01-21 04:45:45 2025-01-21 04:45:45 2025-01-21 04:45:45 2025-01-21 04:45:45 2025-01-21 04:45:45 2025-01-21 04:45:45 2025-01-21 04:45:45 2025-01-21 04:45:45要建造跨度7米的钢筋混凝土架空梁柱截面为50cmx50cm承受一层楼板厚12cm14cm沙砖楼面墙求梁的配筋
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