【单选题】关于匀变速直线运动中加速度的方向和正负值,下列说法中错误是( )
A.
匀加速直线运动中,加速度方向一定和初速度方向相同
D.
只有在规定了初速度方向为正方向的前提下,匀加速直线运动加速度才取正值
【单选题】听力原文:W: I think the last question is very difficult. M: Lot's go and ask Mr. Green. Who are they going to ask about the question?
【单选题】-- Did you watch the basketball match last weekend? --- Yes, I did. It was covered , and I think it was wonderful.
【单选题】Personally, I think the minutes from the last meeting were OK. I agree with Mr. Hobbs and ask the Board for approval.
【单选题】物体做直线运动时,有关物体加速度和速度的说法中正确的是()
【单选题】As I recall my plane trip around the world last July and August, I think my difficulty was the adjustment to the different ______ served with the food in the various cities we visited.
【简答题】翻译下列单词和词组 1. order v. 2. deliver v. 3.schedule v 4. out of stock
【多选题】物体做直线运动时,有关物体加速度和速度的说法中正确的是()
D.
只有在确定初速度方向为正方向的条件下,匀加速直线运动中的加速度才为正值
【简答题】"Personally, I think the minutes from the last meeting were OK. I agree with Mr. Hobbs and ask the Board for approval."