The VC,FEV 1,V 75 ,V 25 residual volumes (RV) and ratio between RV and TLC showed significant difference compared with those in the control group.

• 接触组肺功能指标中肺活量稍高于对照组,第一秒用力肺活量和75%25肺活量时呼气流速小于对照组;