单项选择题
碱性的强弱顺序为()
A.CH3NH2〉(CH3)2NH〉(CH3)3N〉NH3
B.(CH3)2NH〉CH3NH2〉(CH3)3N〉NH3
C.(CH3)3N〉(CH3)2NH〉CH3NH2〉NH3
D.NH3〉CH3NH2〉(CH3)2NH〉(CH3)3N
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