A:m>1
B:m<1
C:m≤1
D:m≥1
质量相等、初温相同的水和煤油,分别用两个相同的电加热器加热(不计热损失),加热过程中温度变化如图所示,则下列判断正确的是( )
There were two children ahead, walking_______.( )