Good table manners
We are going to hold a talk on good table manner. The purpose of the talk is to teach students
为了比较水和沙石的吸热能力,所使用的实验器材有:两个相同的酒精灯、烧杯、温度计、水和沙石.
如图所示,电流表的示数为____ A,电压表的示数为____ V.
如果a=2+3,b=12-3那么( )