以下有()种地下水除铁除锰曝气装置淋水密度一般可采用5~10m3/(h•m2)
①淋水装置
②喷水装置
③板条式曝气塔
④接触式曝气塔
A.④
B.③
C.②
D.①
参考答案:A
脑肿瘤代谢物的测定()
A.in-outphase
B.水成像
C.DWI
D.MRS
E.DTI
been there with me,I would have felt terrible at the ceremony. [ ]
A.If my friends not
B.Had my friends not
C.Have my friends not
D.If my friends didn't