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Auxiliary fixture for precisely measuring pore sizes
The invention discloses an auxiliary fixture for precisely measuring pore sizes. The auxiliary fixture comprises a fixture body (1), a tightening screw (2), a tightening piece (3) and a spring (4)…
Measuring method for thickness of extremely thin covering layer
The invention discloses a measuring method for the thickness of an extremely-thin covering layer, comprising the following steps of: sampling in a way of being obliquely crossed with a covering layer…
Herbal acne-eliminating cream
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Process for synthesizing 5-aminovaleric acid hydrochloride
The invention relates to an efficient novel method for synthesizing photosensitizing agent 5-ketoamine valerate hydrochloride. The method uses compounds of formula (I) and formula (II). In the…
Preparation method of demebeverine hydrochloride
The present invention relates to a preparation method of norfenefrine hydrochloride. In the method, the target compound is prepared from m-hydroxybenzaldehyde as raw materials by addition reaction…