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【单选题】
对静止在光滑水平面上的物体施加一水平拉力F,力刚开始作用的瞬间( )A.
物体立即获得速度
B.
物体立即获得加速度
C.
物体同时获得速度和加速度
D.
由于物体未来得及运动，所以速度和加速度都为零
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举一反三
【单选题】Fill in the blanks with the words given without changing the forms of them. You can not use any of the words twice. You can either write down the word or the letter beside it.
A.
characterized
B.
collaboration
C.
follow
D.
hypotheses
E.
intuition
F.
investigation
G.
processes
H.
subjective It turns out that there is really no one way to 1.________ the scientific method. There are key elements that should appear in the 2. ________, but scientists have done in different professions and no one follow exactly the same process. The scientific method describes the 3. ________ by which scientists gain knowledge about the world. It is 4. ________ by six key elements- questions, 5. ________, experiments, observations, analyses and conclusions. These elements are interrelated steps, so they don’t always function in the same order. Other more 6. ________ skills like creativity, experience and 7. ________ also have a place in a scientific method. Science is characterized by professional competition and develops through the 8. ________ of scientists in the worldwide community.
【简答题】Fill in the blanks with the words given without changing the forms of them. You can not use any of the words twice. You can either write down the word or the letter beside it. A. characterized ...