A.
B.
C.
D.
[单选题]A.B.C.D.
[单选题]A.呼吸道合胞病毒肺炎B.金黄色葡萄球菌肺炎C.腺病毒肺炎D.肺炎双球菌肺炎E.支原体肺炎
[单选题]A.2x-y-1=0B.2x+y+1=0C.2x+y-3=0D.2x-y-+3=0