下列血培养系统中,哪一种可既检测普通细菌又可以检测分枝杆菌()
A.BacT/Alert
B.3D
C.BACTEC
D.VITEK
E.Microscan
参考答案:B
多项式ax2﹣4a与多项式x2﹣4x+4的公因式是( )
Miss Zhao hardly has lunch at school, _______? [ ]
A. isn't she
B. doesn't she
C. does she
D. is she