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【简答题】
为什么说改革是中国的第二次革命
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反馈参考答案：
举一反三
【判断题】The symbol "GB/T 14689-2008" denotes that the concern national standard is compulsory.
A.
正确
B.
错误
【单选题】Select the figure that has correct suce roughness symbol according to the latest National Standard. (Single option: 10 points)
A.
(3)
B.
(1)
C.
(2)
D.
None
【单选题】Select the figure that has correct suce roughness symbol according to the latest National Standard. (Single option: 10 points)
A.
(2)
B.
(1)
C.
(3)
D.
None
【判断题】The symbol "GB/T 14689-2008" denotes that the concern national standard is compulsory.
A.
正确
B.
错误
【简答题】电阻R 1 =10Ω，R 2 =20Ω，R 1 和R 2 串联的总电阻为______Ω，并联的总电阻为______。
【单选题】Select the figure that has correct suce roughness symbol according to the latest National Standard. (Single option: 10 points)
A.
(1)
B.
(2)
C.
(3)
D.
None
【单选题】Select the best figure that has correct suce roughness symbol according to the latest National Standard. (Single option: 10 points)
A.
(1)
B.
(2)
C.
(3)
D.
None
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