试验人员带起手套用酒精把样品表面的油污擦拭干净，然后用铣床铣出样品，将铣好的样品装到试样袋中，避免汗液、灰尘、有机物及无机物的污染，贴好标签放到干燥皿中待用。放入光谱仪下进行试验。本试验数据为第四组试验数据。

The tester shall take gloves and wipe the oil stain on the sample surface with alcohol, then mill out the sample with a milling machine, put the milled sample into the sample bag to avoid the pollution of sweat, dust, organic and inorganic substances, stick a label and put it in a dry dish for use. Put it under the spectrometer for test.This test data is the fourth group of test data.