电路的三种状态是（）、开路状态和短路状态。
参考答案：额定状态
My first ________ of him was that he was a kind and thoughtful young man.[ ]
A. expression
B. attention
C. satisfaction
D. impression
方针目标制定的依据是过去的实际成绩、问题两个方面。（）
