当人体处于如图b所示状态时�吸肌的状态和气体经过的路线分别是a收缩外界气体→食管→肺b收缩肺→气管→口腔→外界c舒张外界气体→ Template




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tomski当人体处于如图b所示状态时�吸肌的状态和气体经过的路线分别是a收缩外界气体→食管→肺b收缩肺→气管→口腔→外界c舒张外界气体→ coloring