问题
多项选择题
在干线设计时，必须考虑对高端频道的电视信号作一定的补偿，以保证高端频道的信号电平均衡式为（）。
A、频率补偿
B、斜率校正
C、斜率控制
D、信号补偿
E、以上皆不是
答案
参考答案：A, B, C
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在干线设计时，必须考虑对高端频道的电视信号作一定的补偿，以保证高端频道的信号电平均衡式为（）。
A、频率补偿
B、斜率校正
C、斜率控制
D、信号补偿
E、以上皆不是
参考答案：A, B, C
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| Most American families like to take a vacation 1 summer. Summer is a good season 2 vacation. It is very hot during the months of July and August. Children do not go to school during these 3 months. Some 4 like to stay at home during the holiday. They work in the garden, visit friends, 5 books, or 6 TV. Many families 7 their lunch to a park or somewhere far 8 the city. They like to eat where there are many trees or there is a nice lake. If they live near the sea, they often go to the beach. They can fish, swim or enjoy the sun there. America is a large country. Many families travel by 9 or by train to see interesting places. They also travel by plane to a foreign country. Many big cities 10 many famous buildings, shops and other places for travelers.
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