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在尿素中添加甲醛，能有效的增加成品尿素颗粒的强度，提高成品尿素粒度。
Through adds formaldehyde in the process of making urea grain, can efficiently increases the strength of urea and raises the particle size for urea.
以球形尿素颗粒为造孔剂，采用传统的粉末冶金工艺制备开孔泡沫铝并研究了其性能。
Open cell aluminum foams were prepared by traditional powder metallurgy process, with spherical carbamide particles as the space-holder.
以球形尿素颗粒为造孔剂，采用传统的粉末冶金工艺制备开孔泡沫铝并研究了其性能。
Open cell aluminum foams were prepared by traditional powder metallurgy process, with spherical carbamide particles as the space-holder. The properties of open cell aluminum foams were studied.
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