一阶系统时域参数k的影响 T=1； for k=[1.1 1.2 1.3 1.4 1.5]; G=tf([k],[T 1]); [h,t]=step(G,6); plot(t,h,'Displayname',['k=' num2str(k)]) hold on end legend('location','best') 一阶系统时域参数T的影响 k=1； for T=[1 2 3 4 5]; G=tf([k],[T 1]); [h,t]=step(G,6); plot(t,h,'Displayname',['T=' num2str(T)]) hold on end legend('location','best') 二阶系统时域xi的影响 wn=1; for xi=[0.2 0.5 0.8 1.0 1.2]; G=tf([wn^2],[1 2*xi*wn wn^2]); [h,t]=step(G,30); plot(t,h,'Displayname',['xi=' num2str(xi)]) hold on end legend('location','best') hold off 二阶系统时域…

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音标 IPA International Phonetic Alphabet DJ音标IPA88 音标发音 Phonics拼读法（母语不用音标) In English, there are around 44 phonemes (sounds), but there are around 250 graphemes (letters or letter groups that correspond to a single sound). This is because every phoneme (sound) corresponds to more than one grapheme (letter or letter groups) across different words. For example, the phoneme…

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