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15.搬运工人沿粗糙斜面把一个物体拉上卡车,当力沿斜面向
上,大小为F时,物体的加速度为;若保持力的方向不
变,大小变为2F时候,物体的加速度为,则
A. B
C. D
D.塔里木河处于丰水季节
参考答案
1 |
2 |
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5 |
6 |
D |
D |
A |
B |
A |
C |
7 |
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10 |
11 |
12 |
B |
D |
A |
A |
D |
C |
13 |
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16 |
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18 |
B |
A |
D |
C |
B |
C |
19 |
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24 |
C |
D |
B |
C |
B |
C |
25 |
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30 |
A |
A |
D |
C |
A |
D |
31 |
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34 |
35 |
36 |
A |
D |
A |
B |
D |
D |
37 |
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42 |
D |
A |
D |
C |
B |
D |
43 |
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48 |
D |
A |
C |
B |
A |
D |
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A |
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C |
D |
B |
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55 |
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A |
D |
B |
D |
B |
A |
61 |
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64 |
65 |
66 |
D |
A |
C |
C |
A |
D |
67 |
68 |
69 |
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72 |
C |
B |
B |
B |
A |
D |
73 |
74 |
75 |
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D |
B |
B |
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