问题
选择题
— Where's the ball?
— [ ]
A. He's over there.
B. It's under the bed.
C. It near the bed.
答案
答案：B
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— Where's the ball?
— [ ]
A. He's over there.
B. It's under the bed.
C. It near the bed.
答案：B
采用原子吸收分光光度法分析尿样中的铜，测定结果见表7。试计算样品中铜的含量
| 表7 | |||||
| 加入Cu的浓度/(μg/mL) | 0 | 2.0 | 4.0 | 6.0 | 8.0 |
| 吸光度值/A | 0.280 | 0.440 | 0.600 | 0.757 | 0.912 |