一 What if someone calls you when you are out?
一 Well. If anyone calls, tell him I'll come back soon.
A:in a short time
B:finally
C:suddenly
两只小灯泡的电阻分别为R1和R2,且R1=2R2.当两灯串联后接在某电源上,其总功率为P1;当两灯并联后接在同一电源上,其总功率为P2.则P1:P2为( )
函数fx=log12x2-3x+2的值域是( )