A:filled
B:filling
C:to fill
D:being filled
年满18周岁公民的有权随意变更自己的姓名。( )
我们了解各种情绪及表现的意义是( ) ①保持身心健康 ②维护良好的人际关系 ③及时调整,改善心情 ④有利于我们控制他人
Here is the bulletin board in Class 2. Some of the notes can be seen every day. Here are some notes before a holiday. Please read them and answer the following questions.
如图所示电路,电源电压一定。电阻R1的阻值为R2的2倍。当开关S1、S2都闭合时,电流表A1的示数为I1,电流表A2的示数为5I1。当开关S1、S2都断开时,电流表A1的示数为I1′。则I1′与I1之比为( )