ureasen.[生化]脲酶；尿素酶urean.尿素urease-- producing bacteria脲酶产生菌Urea ammoniopotassium phosphate尿素磷铵钾urea-phosphate fire retardant尿素-磷酸酯阻燃剂urea-formaldehyde resin fibre脲醛树脂纤维urea extractive crystallization尿素抽提结晶作用urea-hydrogen peroxide adduct过氧化氢尿素Urea types and application rates尿素类型及用量ureaplasma urealyticum infection溶脲脲原体感染urea-ammonium nitrate solution尿素-硝铵溶液urea-based compound fertilizer尿基复合肥