问题
填空题
双极性不归零码，因其（）同步信息，可采用（）提取同步信号；单极性归零码，因其（）同步信息，可采用（）提取同步信号。
答案
参考答案：不含；自同步法；包含；窄带滤波器
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双极性不归零码，因其（）同步信息，可采用（）提取同步信号；单极性归零码，因其（）同步信息，可采用（）提取同步信号。
参考答案：不含；自同步法；包含；窄带滤波器
| Cloze test. 完形填空。 |
| Look 1 this picture. This is a 2 of a classroom. In the picture you can see some desks 3 chairs. 4 the blackboard, you can see a cat. A map is 5 the door. The classroom is very big and bright. Under the 6 table there is a ball, 7 you can't see it. The boy with a cap on the head is 8 friend Jim. He is a new pupil. He is 9 American. He looks 10 Kate. But they are not twins. |
| ( ) 1. A. in ( ) 2. A. map ( ) 3. A. or ( ) 4. A. On ( ) 5. A. behind ( ) 6. A. teacher's ( ) 7. A. but ( ) 8. A. me ( ) 9. A. a ( ) 10. A. after | B. on B. picture B. but B. To B. in B. teachers' B. and B. mine B. an B. at | C. at C. room C. there C. In C. at C. of teacher C. or C. I C. the C. the same | D. to D. door D. and D. At D. of D. teacher D. there D. my D. I D. like |