C-3位为氯原子,亲脂性强,口服吸收好的药物是()
A.头孢氨苄
B.头孢克洛
C.头孢呋辛
D.硫酸头孢匹罗
E.头孢曲松
参考答案:B
We chose the persons and these people did .
A.special something
B.something special
C.special anything
D.anything special
如图所示,一重为2N的木块静止在水平桌面上,请画出木块受到的重力的示意图.