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urea formaldehyde
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urea formaldehyde
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尿素
释
urea formaldehyde
脲甲醛
由尿素和甲醛在一定条件下反应缩合的产物。白色无味粉末或颗粒状,难溶于水,不挥发,不吸湿,施入土壤后,在水解与微生物侵袭的双重作用下缓慢地释放其养分。它不是单一化合物,而是由链长与分子量所不同的甲基尿素缩合而成,其中包含从一甲基二脲至五甲基六脲等系列聚合物,其全氮(N)含量大约38%。
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Clifford group
Clifford-Klein form problem
Clifford minimal hypersurface
Clifford number
Clifford Odets
Clifford parallel
Clifford parallels
Clifford ring
Clifford semigroup
Clifford surface
Clifford theorem
Clifford theory
Clifford torus
Clifford translation
Clifford wavelet
cliffs and waves patterns
Cliffside Caves in Chongxiangsi
Cliffside Caves in Liuzui and Zhengshan
Cliffside Caves in Nengrensi
Cliffside Caves in Niujiaozhai
Cliffside Caves in Pujiang
Cliffside Image in Yujishan
Cliffside Images
Cliffside Images in Banyueshan
Cliffside images in Daxiangshan
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