摘要：
In a certain project, I need to calculate the altitude of the current location given the current location temperature and current location pressure. Temperature, pressure and altitude of a 'reference-level' could be provided if necessary (using a fixed sea-level pressure constant is also acceptable). This project is done between altitudes of-100 meters to 2000 meters above sea level. 阅读全文
摘要：
通过 DNS 查询，得到域名的 IP 地址，才能访问网站。
那么，DNS 查询到底是怎么完成的？本文通过实例，详细介绍背后的步骤。 阅读全文