A:Because he was at home every day.
B:Because he played the violin every day.
C:Because he did homework every day.
标语、口号带有特定时代的历史印记。下列口号中,最能体现五四运动时代诉求的是( )
物质
实验次数
体积(cm3)
质量(g)
质量/体积(g/cm3)
甲
1
10
18
1.8
2
20
36
3
30
54
乙
4
8
0.8
5
16
6
24
①点燃酒精灯②加热③用试管夹夹持试管④向试管中倒入约2mL食盐水⑤将试剂瓶放回原处.