【判断题】气质有好坏之分,气质决定智力发展的高低和成就水平,但气质不影响活动的效率。
【单选题】电容器上标有 “30μF , 600V” 的字样, 600V 是指 ( )
【单选题】下图所示电路中,电流源的端电压U 等于:( )
【简答题】I ran into a stranger as he passed by. 'I'm so 36 !' was my reply. Then he said, 'Excuse me too. I wasn't even 37 you' .We were very polite, this stranger and I. 38 at home, a different story is told-...