问题
选择题
—Can you go to Langlang’s concert with me?
—Sorry, I have to finish the project. Maybe ______time. [ ]
A. another
B. other
C. the other
D. other
答案
答案:A
—Can you go to Langlang’s concert with me?
—Sorry, I have to finish the project. Maybe ______time. [ ]
A. another
B. other
C. the other
D. other
答案:A
在制取CO2的实验中,小科发现质量相同而颗粒粗细不同的大理石与盐酸反应,CO2的产生速率大理石细的比粗的快得多.经思考后,小科设计了如下实验.请你完成下表(每次实验用大理石质量1g,盐酸20mL).
实验序号 | 实验温度 | 大理石颗粒 | 盐酸质量分数(%) | 实验目的 |
① | 20 | 粗 | 5 | 实验:探究大理石和盐酸的反应速率与大理石颗粒粗细的关系;实验:探究大理石和盐酸的反应速率与______的关系 |
② | ______ | 细 | 5 | |
③ | 20 | 粗 | 10 |