教室里有12盏日光灯，分为4组，由三只开关分别控制，当一只开关闭

教室里有12盏日光灯，分为4组，由三只开关分别控制，当一只开关闭合或断开时，其中有一组的4盏灯就会同时发光或同时熄灭，而不影响其它各组灯的工作。由此可判断，每组的4盏灯之间是_______，而各组灯之间是_________。(选填“串联”或“并联”)

答案

并联并联

相关题目

________more careful, his ship would not have sunk. A. If the captain were

________more careful, his ship would not have sunk. A. If the captain were B. Had the captain been C. Should the captain be D. If the captain would have been

英国近代科学家培根所述：“第一种在文学上，第二种在战

英国近代科学家培根所述：“第一种在文学上，第二种在战争上，第三种在航海上，由此又引起了无数的变化。这种变化如此之大，以致没有一个帝国

读北半球某条纬线图，图上度数表示经度，①――④数字表

读北半球某条纬线图，图上度数表示经度，①――④数字表示四条大河的大致入海口，读图回答关于四条河流河口及其附近自然环境的说法，正确的是A

先化简，再求值（2a＋3）（a－1）－

Passage 2Dear Linda, I have been in England three months now. I hope you don't t

Passage 2Dear Linda, I have been in England three months now. I hope you don't think I've forgotten you. There have been so many places to see and so many things to do that I've not had much time for

质量相同、温度相同的铁块和铜块，放出相等的热量后，使

质量相同、温度相同的铁块和铜块，放出相等的热量后，使它们接触，这时铁块将(c铁>c铜)： A.吸热; B.放热; C不吸热也不放热; D.无法

--- What do you think of Jane, Peter? --- It’s not too difficult to get alon

--- What do you think of Jane, Peter? --- It’s not too difficult to get along with her, but sometimes she is too _____ to what people say. A. sensitive B. permanent �

“神州”六号载人飞船发射升空。火箭点火起飞，588秒后，

“神州”六号载人飞船发射升空。火箭点火起飞，588秒后，飞船与火箭分离，准确入轨，进入椭圆轨道，飞船飞行到第5圈实施变轨，进入圆形轨道绕地

教室里有12盏日光灯，分为4组，由三只开关分别控制，当一只开关闭

答案

相关题目

最新题目