问题
选择题
物体在某时刻的瞬时速度是５m/s，对此速度正确的理解是
A．在该时刻的前１s内，物体的位移为５m
B．在该时刻的后１s内，物体的位移为５m
C．在该时刻的前0.5 s和后0.5 s内，物体的位移共５m
D．若从该时刻起物体作匀速运动，则每秒内的位移是５m
答案
D
某时刻的速度是瞬时速度
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物体在某时刻的瞬时速度是５m/s，对此速度正确的理解是
A．在该时刻的前１s内，物体的位移为５m
B．在该时刻的后１s内，物体的位移为５m
C．在该时刻的前0.5 s和后0.5 s内，物体的位移共５m
D．若从该时刻起物体作匀速运动，则每秒内的位移是５m
D
某时刻的速度是瞬时速度
| 选词填空。 | |
_1_ our love for each other. Whenever I _2_ something special from my father, I would always first ask, "Dad, can I have a hug?" I knew that with these _3_ I could melt his heart. After a hug, he was willing to do just about anything _4_ me. _5_ is it about _6_ that is so powerful? Somehow simply having another _7_ arms around us can make us feel easily accepted. When I _8_ to Asia, I learned that not all families hug each other as much as _9_. In fact, many of my _10_ friends say that hugging seldom happens in their home. A few years ago, I went with a friend to his parents' home in Japan. He _11_ his parents for two years. _12_ we entered his home, I expected his parents to immediately embrace (hug) him. Instead, his father just raised his had and _13_ hello. His mother _14_ welcomed him home, but she did it _15_ the room. | |
| 1. __________ 2. __________ 3. __________ 4. __________ 5. __________ 6. __________ 7. __________ 8. __________ 9. __________ 10. __________ 11. __________ 12. __________ 13. __________ 14. __________ 15. __________ |