【单选题】由或非门构成的基本RS 触发器的约束条件为:
【单选题】Her parents are strict with her and they don't allow her __ out late. [ ]
【单选题】由与非门构成的基本RS 触发器的约束条件为:
【简答题】电烙铁在使用过程中不能以 方式擦锡,电烙铁头上多余的锡要在高温海绵上来回擦入锡盒内。高温海绵只要刚湿润即可,不能太湿,否则容易造成电烙铁头老化。
【单选题】Mary’s parents hope she will become an outstanding pianist and they don’t ________her to go out with her friends even on weekends.