续前 2基频峰分布图 a(um) 20 :-H) B(C-H) Y(.-H) (-H) B(0-H) y10-H (N-H B(N y(N-H C≡C) v(C-C) v(C-C) (C=N) v(C-N (C=O) (-0) 4000360032002800240020001900180017001600150014001300120011001000900800700600500400 g(cm 基频峰分布略图续前 2．基频峰分布图