题目:
汽车以28m/s的速度匀速行驶,现以4.0m/s2的加速度开始刹车,则刹车后4s末和8s末的速度各是多少?
答案:
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参考答案:解析:The line chart indicates the average percentage of household income saved by inhabitants of Hong Kong for the years 1980 to 2003. In 1980, the percentag...