问题
单项选择题
同频干扰C/I需大于等于（）dB。
A、-6
B、0
C、6
D、12
答案
参考答案：D
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同频干扰C/I需大于等于（）dB。
A、-6
B、0
C、6
D、12
参考答案：D
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| Once upon a time the colors of the world started to quarrel. Green said, "Clearly I am the most important. I am the sign of life and hope. I was chosen for grass, trees and leaves. Without me, all animals would 1 ." Blue interrupted: "You only think about the 2 , but consider the sky and the sea. It is the water that is the basis of life and drawn up by the clouds from the deep sea. Without my peace, you would all be nothing" Yellow chuckled(笑道), "You are all so serious. I bring laughter, fun and 3 into the world. " Orange started next to blow her trumpet, "I am the color of health and strength. I may be 4 but I am precious, for I serve the needs of human life. When I fill the sky as the sun rises or 5 , my beauty is so striking that no one gives another 6 to any of you." Red could stand it no longer he shouted out, "I am the ruler of all of you. I am the color of danger and of bravery. I am willing to 7 truth. I am also the color of passion and of love." Then came purple and indigo(深蓝色)… The colors went on boasting, each convinced of his or her own 8 . Their quarreling became louder and louder. Suddenly there was a startling flash of bright lightening thunder. Rain started to pour down 9 . The colors crouched(蜷缩)down 10 , drawing close to one another for comfort. In the midst of the clamor(叫嚷), rain began to speak, "You 11 colors, fighting among yourselves, each trying to dominate the rest. Don't you know that you were each made for a special purpose, 12 and different? Join hands with one another and come to me." Doing as they were told, the colors 13 and joined hands. They formed a colorful rainbow. From then on, whenever a good rain 14 the world, a rainbow appears in the sky. They remember to 15 one another. | ||||
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