问题
选择题
| The house _____ we lived in three years ago is very old. |
A. what B. which C. where D. when |
答案
答案：B
搜题请搜索小程序“爱下问搜题”
| The house _____ we lived in three years ago is very old. |
A. what B. which C. where D. when |
答案：B
除去下列各组物质中少量杂质，所用的试剂和方法正确的是
| 序号 | 物质 | 所含杂质 | 所用试剂和操作方法 |
| A | NaOH溶液 | Na2CO3 | 加入过量CaCl2溶液，过滤 |
| B | Fe粉 | Fe2O3 | 加入适量的稀盐酸，过滤 |
| C | KNO3 | NaCl | 加入足量水溶解，过滤 |
| D | H2 | HCl | 通过足量NaOH溶液，干燥 |