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 extruding speed 怎么翻译 Lucy took 30 minutes to cycle from school to her home at an average speed of 12km/h.If she wanted to reach home 10 minutes early.what must her average speed be?给个翻译和答案, 新加坡交通情况求2009年新加坡私家车和公共交通平均旅客运距(average trip length)、平均出行时间(average time)、平均速度(average speed).有大神能把下面的表格补全就更感谢了. His average speed had been 301 miles per hour.句子成分 A speed relative to average reading speed=1.2什么意思到底是A快还是average reading speed快?A是average reading speed的1.2倍还是average reading speed是A的1.2倍?换言之,如果A speed relative to average reading speed=0.9是否说,A 英文数学题Ben cycles to a city at average speed X and returns at average speed Y.His average speedfor the whole trip is ( ) average average average average AVERAGE 自行车码表上AVG.SPEED的avg是什么意思?是算average的缩写还是什么的 his average speed had been 299 miles per hourhad been 是什么? Campbell was disappointed to learn that his average speed had been 299 miles per hour.句子成分 求：the average speed over the 8 miles is 33 miles per hour.怎么翻译. average和general的区别