【单选题】“ __________ were you born?” “On May 12, 1985”. [ ]
【单选题】—________were you born? —On May 12,1985.
【单选题】“ __________ were you born?” “On May 12, 1985”.
【简答题】电路的主要作用是:首先能实现电能的( )、( )和( ),其次是实现信号的( )、( )。
【简答题】(本小题13分) 已知集合A={x|a≤x≤a+3},B={x|x5}. (1) 若 ; (2) 若A∪B=B,求a的取值范围.
【判断题】Were you born on May 21,1974?