问题
单项选择题
在晶闸管的电流上升到其（）电流后，去掉门极触发信号，晶闸管仍能维导通。
A、维持电流
B、擎住电流
C、额定电流
D、触发电流
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
在晶闸管的电流上升到其（）电流后，去掉门极触发信号，晶闸管仍能维导通。
A、维持电流
B、擎住电流
C、额定电流
D、触发电流
参考答案：B
| 根据句意从方框中选用合适的词，并用其适当时态填空，使句子通顺。 | |
2. He will go out to play football if his homework _____. 3. His father often _____ newspapers after breakfast last year. 4. Where is Jake? He is out. He _____ home in two hours. 5. Bad luck! We _____ Wolf Hill when it rained heavily. |