1. mathematical constant: http://www.mathsoft.com/asolve/constant/constant.html 这个地址有各个常用数学常数的讲解. 2. Fundamental Physical Constants: http://physics.nist.gov/cuu/Constants/index.html?/codata86.html 这个地址可以用各种手段搜索你想要的物理, 物理化学常数. 3.The fundamental constants and energy conversion factors. http://www.npl.co.uk/npl/reference/index.html 4.这个地址很有用: http://icpr.snu.ac.kr/education/usefultool.html 是各种网上科学查阅转换工具地址的收集. 5. 这个也是: http://www.library.qmw.ac.uk/sci/data.htm