问题
选择题
---- Do remember to charge the battery 12 hours when you first use it.
---- _____.[ ]
A. Made it
B. Got it
C. Understood it
D. Remembered it
答案
答案：B
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---- Do remember to charge the battery 12 hours when you first use it.
---- _____.[ ]
A. Made it
B. Got it
C. Understood it
D. Remembered it
答案：B
除去下列各物质中的杂质，所用试剂和方法均正确的是（ ）
| 选项 | 物质 | 杂质 | 除去杂质所用的试剂和方法 |
| A． | N2 | O2 | 铜粉 加热 |
| B． | Na2CO3溶液 | NaOH | CaCl2溶液 过滤 |
| C． | NaCl固体 | NaOH | 水 过滤 |
| D． | CO2 | CO | 氧气 点燃 |
A．A
B．B
C．C
D．D