【判断题】应用动点动系求速度和加速度时 , 若选取同样的动点动系,2者的分析格式将很类似。分析完速度后,分析加速度时,只要将速度合成定理中的速度量换成切向加速度,方向也是切向方法, 再补充上法向加速度和科氏加速度(动系转动时),未知量对应的位置也是相同的。因此,能分析速度,必然就可以分析加速度问题。
【单选题】The nature reserve is a good place _______ wild animals ____ live ___.
【简答题】t__________ v. to make (an animal) tame (not wild) or to make sth easy to control
【单选题】When the fire broke out, many people were so _____ that they ran _____. [ ]
【单选题】They ______ that wild animals should be left in the wild and not used for entertainment.
【单选题】The farmers built long fences, ____ keeping the wild dogs out of them.