题目内容
双绞线一般以箱为单位,每箱双绞线的长度为 1000米。
查看答案
搜索结果不匹配？点我反馈
更多问题
无线通信技术中无线电波和红外线是沿所有方向发射,微波和激光只能向某个固定方向传输。
单模光纤采用发光二极管作为光源。
无线网络的干线部分基本上都是有线的。
Quiz 1 (选词填空) (填单词对应字母)A. stretched out B. mereC. ashamed ofD. recurringE. sweatingF. motionG. emotions H. anxietyI. On one occasionJ. startled1. He was _______________ by the sound of the back door opening in the dead of night.2. There is nothing serious about the damage; it is a ____________ scratch (划痕) on the door of the car.3. Mom was singing a lullaby to my baby sister while rocking the cradle with a gentle backwards and forwards ________________.4. Tense and hot, we were really ________________ as we waited for them to announce the results.5. He sat leaning against the back of the seat with his legs _____________ straight in front of him.6. Mike is an extremely careless man. ________________________, it was not until he got to an ATM that it occurred to him he had left his card at home.7. Young children often feel a lot of _______________ about their first day at school.8. Stan tends to be driven by his ________________ -- he rarely considers the consequences of his actions.9. She ought to be thoroughly ___________________ herself for talking to her guests in such a rude way.10. He had tried to put the unpleasant scene out of his mind, but it kept on _______________ to him, especially in dreams.
微信支付 
支付宝支付