问题
选择题
—_____ in the lake?
—There's a beautiful boat.[ ]
A. What
B. What's
C. How many
D. Where
答案
答案：B
搜题请搜索小程序“爱下问搜题”
—_____ in the lake?
—There's a beautiful boat.[ ]
A. What
B. What's
C. How many
D. Where
答案：B
稀硫酸有许多用途，按要求各写出一个有关反应的化学方程式．
| 序号 | 用途 | 反应化学方程式 |
| ① | 用稀硫酸制硫酸钠 | ______ |
| ② | 用稀硫酸除铁锈 | ______ |
| ③ | 用稀硫酸制硫酸铜 | ______ |
| ④ | 证明“银粉”成分是铝不是银 | ______ |