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【简答题】
用某原子荧光分析法测定试样中的汞含量,获得如下数据: 汞原子浓度 r / ( m g · mL -1 ) 重复测定次数 n 分析信号的平均值 y (相对单位) 标准偏差 s / ( m g · mL -1 ) 0.000 11 0.051 0.0082 0.020 3 0.193 0.0094 0.040 3 0.342 0.0082 0.060 3 0.452 0.0082 0.100 3 0.732 0.0082 0.140 3 1.014 0.0083 0.180 3 1.288 0.0084 0.220 3 1.542 0.0096 0.260 3 1.600 0.0110 0.300 3 1.650 0.0120 试样 1 3 0.826 0.0083 试样 2 3 0.534 0.0082 绘制标准曲线,写出标准曲线的一元线性回归方程,确定其线性范围,试计算该方法的灵敏度、检出限和试样中的汞浓度。
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反馈参考答案：
举一反三
【单选题】.Not only____the book,but also he remembered what he had read.
A.
he had read
B.
had he read
C.
he did read
D.
did he read
【单选题】Hardly (he had) entered (the office) when he realized (that he had) (forgotten) his wallet.
A.
he had
B.
the office
C.
that he had
D.
forgotten
【简答题】叠加定理是对电流和电压的叠加,对(__)不能进行叠加。
【单选题】Not only ______ the book, but he remembered what he had read.
A.
he had read
B.
had he read
C.
did he read
D.
was he reading
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