A:滴加液体
B:检验氧气是否收集满
C:测空气中氧气含量
D:读取液体的体积
甲
95
82
88
81
93
79
84
78
乙
83
92
80
90
85
75
Students used to information from newspapers or magazines, but now they are used to for it on the Internet directly.