精密测量法包括环规测量法、高度测量法、跨棱测量法等；
The precision measurement methods are further grouped into the ring gauge measurement, the high gauge measurement and the stride edge gauge measurement.
目的：筛选环棱褐孔菌中棕榈酸的提取工艺。
Objective:To optimize the extraction technology of palmitic acid of Xanthochrous nilgheriensis Teng.
第二版调焦环上的棱比前一版更宽更深。
The second version also has wider and deeper knurling on the focusing ring than the previous version.
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