The test shows that the measuring method is simple and the result is accurate with cu as the interior label element.

试验表明，采用铜作内标元素，测试方法简便，结果准确。

youdao

The test shows that the measuring method is simple and the result is accurate with cu as the interior label element.

试验表明，采用铜作内标元素，测试方法简便，结果准确。

youdao