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【单选题】
关于动量的变化,下列说法中错误的是A.
做直线运动的物体速度增大时,动量的增量Δp的方向与运动方向相同
B.
做直线运动的物体速度减小时,动量的增量Δp的方向与运动方向相反
C.
物体的速度大小不变时,动量的增量Δp为零
D.
物体做平抛运动时,动量的增量一定不为零
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【简答题】Thousands of years ago, ten of our very distant ancestors were hungry. They went out and picked berries or dug up roots to eat. Four of them chose poisonous food and died. The remaining six noticed th...
【单选题】Thousands of years ago, ten of our very distant ancestors were hungry. They went out and picked berries or dug up roots to eat. Four of them chose poisonous food and died. The remaining six noticed th...
A.
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B.
The Survival of Mankind
C.
Various Patterns of Human Behavior
D.
We Are Creatures of Habit
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【简答题】英译中 For thousands of years we Chinese have always regarded chopsticks the st possible and the most efficient tool for transporting bite-sized morsels of food form. a bowl to the mouth. As early ...
【单选题】How did researchers know that ancient Greeks rushed to watch the Olympics?
A.
Thousands of people came to watch.
B.
The main stadium is still not big enough.
C.
They have found the related record of events.
D.
Many of them were visitors and pilgrims.
【简答题】已知：如图，直线 交⊙O于A、B两点，AE是⊙O的直径，点C为⊙O上一点，且AC平分∠PAE，过C作 于D. 小题1:求证：CD为⊙O的切线； 小题2:若DC+DA=6，⊙O的直径为10，求AB的长.
【简答题】写出图(a)梯形图编程的指令表编程，并画出程序运行时的时序波形图。
【简答题】A computer failure can destroy thousands of memories. You can avoid this by keeping your photos backed up______(3 words).
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