单项选择题
如图所示电路中,三只二极管参数相同。若A、B、C三端电压分别为2V、3V、4V,若二极管压降为0.7V,试分析各二极管工作情况,求端口D的电压值。 ( ) A. 0.7V B. 1.7V C. 3.3V D. 2.5V
单项选择题 Discrete element method cannot solve three - dimensional problems.( ) A. 对 B. 错
单项选择题 InChina, friendship is like... A、a flower B、a concentric circle C、a piece of paper D、a bag
单项选择题 It is said that the Santa Claus usually knocks the door and gives presents to children.()A.对B.错