发布时间:2025-01-28 14:17:47
有两种方位指向, 先天八卦是;南乾北坤,东离西坎。
后天八卦是;南离北坎,东震西兑。
八卦不是用来指方向的,它是对方位的一种定性。因为先天八卦指的是阴阳之气的一个盛衰周期性,
而后天八卦指的是事;物的盛衰周期,所以;它们在方位性质上有质的区别。
区别方向用的叫;指南针。
《特种设备制造许可证(压力管道)》A、B、C级划分标准是什么
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