生理死腔是指()
A.未进行过气体交换的肺泡容量
B.无气体交换功能的呼吸道
C.停留在呼吸道内未能实现气体交换的气量
D.肺泡死腔
E.解剖死腔与肺泡死腔
参考答案:E
That boy paints his face red and blue. I don't know who _____.[ ]
A. he is
B. is he
C. he does
D. can he be
艾滋病病毒藏匿何处?