问题
选择题
一How do you like our school?
—I think it’s becoming_________. [ ]
A. more and more cleaner
B. more and more beautiful
C. more beautiful and more beautiful
D. clean and clean
答案
答案:B
一How do you like our school?
—I think it’s becoming_________. [ ]
A. more and more cleaner
B. more and more beautiful
C. more beautiful and more beautiful
D. clean and clean
答案:B
将12g镁在一定量的氧气中燃烧,有如下数据:
第一次 | 第二次 | 第三次 | |
所给氧气的质量/g | 4 | 8 | 16 |
生成氧化镁的质量/g | 10 | 20 | 20 |
(2)第三次实验剩余的物质是______.
(3)第一次生成10g氧化镁而不是16g氧化镁的原因是______.