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【简答题】
动词填空。 1. Let me _____ (play) football with you. 2. He often helps me _____ (make) model planes. 3. She _____ (not do) the housework in the morning. 4. Simon wants _____ (be) a doctor. 5. Would you like _____ (have) some bread? 6. He doesn't enjoy _____ (chat) with others. 7. Jill, _____ (go)to bed now. 8. Amy often _____ (fly) a kite with her parents. 9. Annie and Sandy are good at _____ (draw). 10. _____ your classmates _____ (watch) TV on Sundays?
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【简答题】独立的二元信息序列X 1 X 2 X 3 X 4 与二元校验序列X 5 X 6 X 7 的校验关系如下所示， 2X 1 +X 2 +X 3 =X 5 ，X 1 +X 3 +X 4 =X 6 ，和X 1 +X 2 +X 4 =X 7 ，上式中的加法为模二加，例如：X 1 X 2 X 3 X 4 为1011，校验比特X 5 X 6 X 7 为010。 注：题中所给的信道编码为(7，4)汉明码，可以纠正...
【简答题】序列1{1,2,3}与序列2{5,6,7,3,2},二者线性卷积后得到的序列是
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