average velocity和average speed区别在哪?

average velocity和average speed区别在哪? average speed 和average velocity 有什么区别?不要解释的太复杂.简单点就好. average velocity squared of a molecule 翻译 speed和'velocity的区别 微积分speed和velocity区别 velocity 和 speed 的区别是什么? speed和velocity有什么区别? speed和velocity有什么区别 ae中speed和velocity区别 average average average average AVERAGE average和general的区别 an average of 和the average of的区别 the average of和 a average of 有区别吗 in an average 和 on average的区别