题目内容

晶闸管可以通过在门极施加负的脉冲电流使其关断。

A. 对
B. 错

查看答案
更多问题

某晶闸管的额定电流为200A,额定电压为500V,则该晶闸管的型号为____。

Questions 1 and 2 are based on the news report you have just heard.[音频]

A. Enrol him in a Newcastle football club.
B. Send him to an after-school art class.
C. Forbid him to draw in his workbook
D. Help him post his drawings online.

Questions 2 are based on the news report you have just heard.

A. Contacted Joe to decorate its dining-room.
B. Hired Joe to paint all the walls of its buildings.
C. Renovated its kitchen and all the dining-rooms.
D. Asked Joe for permission to use his online drawings

Questions 3 and 4 will be based on the following news item.[音频]

A. Get her pet dog back.
Beg for help from the police.
C. Identify the suspect on the security video.
D. Post pictures of her pet dog on social media.

答案查题题库