问题
单项选择题
三相半控桥式整流电路的最大导通角是（）。
A、90°
B、120°
C、150°
D、180°
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
三相半控桥式整流电路的最大导通角是（）。
A、90°
B、120°
C、150°
D、180°
参考答案：B
| 句型转换。 1. People all over the world know the Great Wall. (改为被动语态） The Great Wall _____ _____ _____ people all over the world. 2. My little brother is too short to reach the apple on the Table. (改为同义句) My little brother is _____ short _____ he can't reach the apple on the table. 3. My friend told me some good news.（改为被动语态） Some good news _____ _____ to me by my friend. 4. The old man no longer lived there.（改为同义句） The old man _____ live there _____ _____. 5. My teacher offered me some good advice yesterday. (改为同义句) My teacher _____ some good advice _____ me yesterday. |