截面惯性矩
截面极惯性矩
中心惯性矩
Sport is the second fastest growing sector of the economy at the moment - and the biggest growth area is betting.
BBC: CHOOSE A SPORT
英汉双解词典包含3185865条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。