A:碘升华
B:溴蒸气被木炭吸附
C:酒精溶于水
D:HCl气体溶于水
如图所示,将灯L1、L2按甲、乙两种方式接在电压均为U的两个电路中。L1在甲、乙两个电路中的电功率分别为4W和9W,设两灯泡的电阻不变,则L1、L2两灯泡电阻之比为____。
要求:自拟题目;围绕中心,叙事完整;不少于500字。
解释下列词语。
①枯燥
②苏醒
Look, this is my city. There are many bikes and buses on the streets. Let's count. There are ____ bikes and ____ buses. Look here, there are also ____ taxis and ____ cars. My city is big and beautiful!