To begin, change to any random directory on your machine.
要开始测试，请切换到机器上的任意随机目录。
Your browser window will change to a random number between 0 and 27.
您的浏览器窗口将更改到一个介于0到27之间的随机数字。
Impulse and momentum change; rocket equation; origin of pressure from random motion.
冲量，动量的改变；火箭方程；随机运动的压力作用点。
Impulse and momentum change; rocket equation; origin of pressure from random motion.
冲量，动量的改变；火箭方程；随机运动的压力作用点。
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