问题
单项选择题
地球站天线系统由天线、馈源和（）3部分组成。
A.跟踪伺服系统
B.发射系统
C.接收系统
D.电源系统
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
地球站天线系统由天线、馈源和（）3部分组成。
A.跟踪伺服系统
B.发射系统
C.接收系统
D.电源系统
参考答案：A
| 从方框中选择合适的词，并用正确的时态填空。 | |
1. Our English teacher always _____ us to read English crazily. 2. When I got home yesterday, Mum _____ the floor in the kitchen. 3. Mr Wang with his students _____ their plans for the winter holidays at the moment. 4. At last, my father _____ to buy me a new computer as a new year present. 5. —Are you still working on the project? —Yes, and I _____ it in half an hour. |