单项选择题
A.1~4mg/L; B.5~10mg/L; C.5~15mg/L; D.20~25mg/L; E.>25mg/L.
A.症状; B.体征; C.致病诱因; D.哮喘分期分级; E.体质.
A.头孢噻肟钠 B.头孢唑林 C.青霉素G D.红霉素