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【单选题】
质量为m的质点在外力作用下,其运动方程为 ,式中A.
B、 的常量.由此可知外力在t = 0到t = /(2 )这段时间内所作的功为( ) (A)
B.
C.
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【单选题】Part IV Reading Polluting the planet Burning fossil fuel is perhaps the greatest cause of pollution. But it is also the main way to make energy. The cheapest way to make electricity is with power plan...
A.
It is a great cause and a great means of energy.
B.
It causes pollution but it is a great source of energy.
C.
It causes pollution and electricity.
D.
It causes coal to be transported to a power plant.
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【简答题】活动中教师观察的一般视角具有普遍意义,这种观察方式观察的视角包括: A活动兴趣 B认知水平 C个性心理 D规则意识
【单选题】IX. Reading comprehension: (24分) A. Choose the best answer: (6分) ★ Most great inventors often met with much trouble in their work. Before they could succeed, they had to overcome thousands of difficul...
A.
the life of George Stephenson
B.
the invention of the train
C.
the trouble George Stephenson met in his invention
D.
the use of the engine on the train
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