22.Finally it was decided to have a flat floor for the auditorium because it will be better for _______. (A Center for Chinese and American Studies) A)dances B)lectures C)films and slides D)all purposes
参考答案:
肺气肿患者的胸廓前后径与左右径的比例约为:( )
肺气肿患者的胸廓前后径与左右径的比例约为:( ) A. 1∶2 B. 1∶1 C. 1∶2.5 D. 1∶1.5 E. 2∶1