They want ____ (fly) kites on the playground.
提出“为政以德,譬如北辰(北斗星),居其所而众星共(拱)之”的思想家是( )
如图(a)所示电路中,当闭合开关后,两只电压表的指针偏转均如图(b)所示,则电阻R1和R2两端的电压分别为( )