问题
选择题
— I'm going to San Francisco for a couple of days.
— ____ . I wish I could get away for a while. [ ]
A. It doesn't matter
B. Forget it
C. I really envy you
D. I can't agree more
答案
答案:C
— I'm going to San Francisco for a couple of days.
— ____ . I wish I could get away for a while. [ ]
A. It doesn't matter
B. Forget it
C. I really envy you
D. I can't agree more
答案:C
为了探究化学反应中各物质之间的质量的关系,小敏同学做了五组氢气在氧气中燃烧的实验,实验结果记录如下:
编号 | H2的质量/g | 0℃、101KPa下O2的体积/L | 生成H2O的质量/g |
1 | 1.2 | 22.4 | 10.8 |
2 | ① | 22.4 | 19.8 |
3 | 4.0 | 22.4 | 36.0 |
4 | 5.0 | 22.4 | 36.0 |
5 | 6.0 | 44.8 | ② |
A.①2.0g ②54.0g
B.①2.2g ②45.0g
C.①1.6g ②72.0g
D.①2.2g ②54.0g