力F1、F2共线如图示,且F1=2F2,方向相反,其合力FR可表示为()。 A. B 发布时间:2017-12-18 20:21 │ 来源:www.tikuol.com 题型:单项选择题 问题: 力F1、F2共线如图示,且F1=2F2,方向相反,其合力FR可表示为()。A.B.C.D.
题型:单项选择题 —________? —They are 30 dollars. [ ]A. What are those B. How much is your jacket C. What color are these hats D. How much are the pants 查看答案