羟甲基尿素
methylol urea
hydroxymethylurea
Hydroxymethyl-urea
formaldehyde treated urea
ur ea
秋施尿素
Autumn application of urea
全循环法尿素
total solution recycling method
全循环尿素装置改造
Modifications of urea plant with total recycle process
热循环尿素工艺
heat recycle urea process
日粮尿素利用
utilization of urea in the diet
熔融尿素给料泵
melting urea feeding pump
熔融尿素升压泵
booster pump for molten urea