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
---- 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