问题
填空题
No.7信令系统的四级结构中，消息传递部分（MTP）包括（）、信令链路和信令网功能三级。
答案
参考答案：信令数据链路
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No.7信令系统的四级结构中，消息传递部分（MTP）包括（）、信令链路和信令网功能三级。
参考答案：信令数据链路
| 选词填空。 | |
2. Of course you should _____. 3. Have you ever had a(n) _____? 4. Did you _____ advice? 5. Cold running water helps _____ a small-burn. 6. Make her _____ and stay with her. 7. What would you do if you _____ your knee? 8. When you _____ a task, use what you already know to help you. |