问题
多项选择题
可以实现不同额定频率电网互联的是（）。
A.传统高压直流输电
B.背靠背直流输电
C.电压源型直流输电（VSC-HVDC.
D.柔性交流输电
答案
参考答案：A, B, C
搜题请搜索小程序“爱下问搜题”
可以实现不同额定频率电网互联的是（）。
A.传统高压直流输电
B.背靠背直流输电
C.电压源型直流输电（VSC-HVDC.
D.柔性交流输电
参考答案：A, B, C
| 完形填空。 | |||
| Look at this picture. This is a photo __1__ my family. There are __2__ people in the picture: my father, my mother, my brother, my sister and __3__ .__4__ father is very happy every day. My mother __5__ near (在……旁边) my father. The boy beside (在……旁边) my mother is my __6__ . The __7__ near my mother is my little sister.__8__ is very clever and cute. Everyone likes her very much. Who is __9__ boy in the middle (在中间)? Ah! It is me.__10__ love my family very much. | |||
| ( ) 1. A. for ( ) 2. A. five ( ) 3. A. me ( ) 4. A. My ( ) 5. A. are ( ) 6. A. sister ( ) 7. A. boy ( ) 8. A. He ( ) 9. A. a ( ) 10. A. I | B. on B. six B. I B. I B. am B. grandfather B. girl B. She B. this B. Me | C. of C. seven C. you C. His C. is C. brother C. son C. They C. the C. My | |