METHOD:These methods were carried out by using some general reagent, test-tube or test paper.

方法：通过试剂、试管、试纸初步判定药品的真假。

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Synthesis technology and property of hydroxypropyl starch by using potato starch as raw material, propylene oxide as etherization reagent and sodium hydroxide as catalyst, were studied in this paper.

本文以马铃薯淀粉为原料，环氧丙烷为醚化剂，氢氧化钠为催化剂对低取代度羟丙基淀粉的制备工艺进行了研究。

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Inorganic water-based silicate sealing reagent used in high velocity arc spray at high temperature is prepared and investigated in this paper.

研究并制备了用于耐高温合金涂层封孔处理的水性无机硅酸盐封孔剂。

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