2022年8月5日
密位
摘要： A milliradian (SI-symbol mrad, sometimes also abbreviated mil) is an SI [国际单位制] derived unit for angular measurement which is defined as a thousandth 阅读全文
posted @ 2022-08-05 13:24 华容道专家 阅读(402) 评论(0) 推荐(0)