环境粉尘浓度的测定一般使用滤膜称重方法测得，该方法费时费力，且不能得到瞬时粉尘浓度的变化。
Weighing filtration membrane is often used to get the dust concentration of environment. However, this method is discommodious and can not get the instantaneous transformation of dust concentration.
一般的膏药生产厂家，对膏布药层质量控制采用的是人工称重方法。
In plaster factory, manual operation method is usually adopted to control quality of a plaster ointment.
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