Which of the following sinuses open into middle nasal meatus? （ ）
A.frontal sinus B.maxillary sinus C.spenoidal sinus D.anterior and middle groups of the ethmoidal sinusus E.posterior group of the ethmoidal sinusus正确答案ABD
Which of the following sinuses open into middle nasal meatus? （ ）
A.frontal sinus B.maxillary sinus C.spenoidal sinus D.anterior and middle groups of the ethmoidal sinusus E.posterior group of the ethmoidal sinusus正确答案ABD
