Code Sample 9: Test for real number precision.
代码示例9：对实数精度的测试。
Code Sample 10: Default precision delta.
代码示例10：默认的精度delta。
It is the lowest amount of analyte in a sample that can be determined with acceptable precision and accuracy under the stated experimental conditions.
它是在规定试验条件下，能够以可接受的精密度和精确度进行测定的样榀中待分析物的最小量。
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