【单选题】Speaker A:______________. Speaker B: It is $10.
B.
Do you want to buy it?
【单选题】晶闸管控制极电压一般要求正向电压反向电压分别不超过( )。
【单选题】Speaker A :___________ ? Speaker B : 10 yuan.
A.
How many books do you have?
【单选题】已知图 中电压表读数为:V 1 : 10V ;V 2 : 10V;V 3 : 10V。则电压 U s 为