如图所示,R 1为定值电阻,R 2为负温度系数的热敏电阻(负温度系数热敏电阻是指阻值随温度的升高而减小的热敏电阻),L为小灯泡,当温度降低时( )
{x2+2xsinA1+sinA2=0x2+2xsinA2+sinA3=0x2+2xsinA3+sinA1=0 均有实根,求这凸4n+2边形各内角的度数.
Lucy writes as ______ as Lily. They are both good students.
I've asked him __________ us for dinner, but he said he was quite busy.