... carbamide end mill 硬质合金端铣刀 carbamide formaldehyde resin 异尿素甲醛树脂 carbamide hob 硬质合金滚刀 ...
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carbamide e formaldehyde resin 异尿素甲醛树脂
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The urea-formaldehyde resin was made from industrial 36% formalin and 46% N carbamide in the laboratory. The urea-formaldehyde resin was used to imbed the insect specimens.
本文探讨了在实验室条件下利用工业用36 ％ 甲醛和含氮46％ 农用尿素合成脲醛树脂包埋昆虫标本的方法。
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