=============== let’s expand on that precisely.1. IPv4 address space size Each IPv4 address is 32 bits long. Therefore, the total number of possible combinations is: [ 2^{32} = 4,294,967,296 ] That’s…

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Q: ip address: 192.168.1.100subnet mask 255.255.255.0why is 192.168.x.x so special?what does this subnet mask mean? 192 in binary form is 11000000168 in binary form is 10101000why these two number ar…

一，安装第三方库 $ pip install flask-cors 二，代码： from flask_cors import CORSapp = Flask(__name__)# 解决存在跨域的问题 CORS(app)

Linux小课堂: 用户管理与权限控制机制详解 - 实践2025-11-12 18:36 tlnshuju 阅读(0) 评论(0) 收藏 举报pre { white-space: pre !important; word-wrap: normal !important; overflow-x: auto !important; displa…

分享一个MySQL万能备份脚本此脚本适用于 MySQL 各个生命周期的版本 #!/bin/bash # mybackup.sh# 备份保留天数，建议保留三天 days=7 # 备份时间 time=$(date +%Y%m%d%H%M%S) # 备份保存路径 backup_dir=/opt/backup #…

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弹性布局（Flex） 核心概念 弹性布局（Flex）是 LVGL 中用于元素排列的灵活布局方式，支持行 / 列排列、自动包裹、剩余空间分配和精准对齐。启用需在lv_conf.h中打开宏LV_USE_FLEX，通过lv_obj_set_layout(obj, LV_LA…