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【简答题】
Families in China attach great importance to the education of their children. My parents think that they should work hard to ensure their children will get a good education. They are willing to spend not only a lot of money on their children's education, but also plenty of time pushing them to learn. Most of the parents hope their children can attend a famous university. Due to China's reform and opening-up, more and more parents are now able to send their children to study abroad or to participate in international exchange programs so that they can broaden their horizons. Through these efforts, they expect their children to grow up healthy and sound and to make their own contribution to the country's development and prosperity.
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A.
0
B.
1
C.
2
D.
3
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B.
C.
D.
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A.
双绞线
B.
同轴电缆
C.
光缆
D.
无线介质
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A.
河南
B.
四川
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山东
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陕西
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4个
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屏蔽类双绞线
B.
非屏蔽类双绞线
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同轴电缆
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光纤
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1个
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2个
C.
3个
D.
4个
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【单选题】设a、b为正数,且a+b≤4,则下列各式中正确的一个是(  )
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1 a + 1 b <1
B.
1 a + 1 b ≥1
C.
1 a + 1 b <2
D.
1 a + 1 b ≥2
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