【简答题】LED由( )个PN结组成,具有单向导电性。
【简答题】LED由( )PN结组成,具有单向导电性
【判断题】LED 灯又叫做发光二极管,具有单向导电性
【简答题】Not yet, it is still open for discussion.
【单选题】在《尚书.洪范》一文中,“金曰从革”中的“革”意为()。
【简答题】LED由( )个PN结组成,具有单向导电性。
【单选题】The noise killing system is not yet popular mainly because
A.
it is still being tried out
B.
drivers still have their doubts
C.
it increases the cost of car production
D.
carmakers are not sure if it is necessary
【单选题】LED 与普通()一样,也是由一个 PN 结组成,具有单向导电性。