第十章单元测试
- International roaming service began in the ________ phase.（ ）。
- 5G radio waves can’t carry data far. How to solve this problem?（ ）。
- Which year did China complete the deployment of BDS-3?（ ）。
- The configuration of BDS does not include 。（ ）
- Which of the following color can't be found in Xue Tao Paper? （ ）。
A:2G B:4G C:3G D:1G
答案:3G
A:Small cellular towers B:Higher cellular towers C:higher band of radio frequencies D:lower band of radio frequencies
A:2022 B:2020 C:2021 D:2019
A:Ground segment B:Space segment C:User segment D:Device segment
A:Grey B:Red C:Pink D:Green
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