N,N'-diphenyl-N,N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine结构式是什么缩写是 TPD N,N'-diphenyl-N,N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine
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N,N'-diphenyl-N,N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine结构式是什么缩写是 TPD N,N'-diphenyl-N,N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine
N,N'-diphenyl-N,N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine结构式是什么
缩写是 TPD N,N'-diphenyl-N,N'-(3-methylphenyl)-1,1'-biphenyl-
4,4'-diamine
N,N'-diphenyl-N,N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine结构式是什么缩写是 TPD N,N'-diphenyl-N,N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine
母体为对联苯二胺(也就是2个苯胺的4位互相连接),每个氮上连一个苯基和一个间甲基苯基;
N,N'-diphenyl-N,N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine结构式是什么缩写是 TPD N,N'-diphenyl-N,N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine
n
n
n
n
请问进口阻聚剂N,N'-Diphenyl-1,4-phenylene-diamine的物性和除去办法啊,我们要苯乙烯中的阻聚剂出去好做树脂啊.
n^(n+1/n)/(n+1/n)^n
2^n/n*(n+1)
(n+1)^n-(n-1)^n=?
证明不等式:(1/n)^n+(2/n)^n+(3/n)^n+.+(n/n)^n
是否存在一个自然数n 使(n+n)+(n-n)+n*n+n/n=1991
请问怎么输出下面的图形,要用C语言设计一程序 n n n n n n n n n n n n n n n n
推导 n*n!=(n+1)!-n!
化简:(n+1)!/n!-n!/(n-1)!
(n-1)*n!+(n-1)!*n
根号(n+1)+n
有n(n
N是自然数 N