在老年人体内表观分布容积没有改变的药物为()
A.地高辛
B.哌替啶
C.地西泮
D.氯丙嗪
E.华法林
参考答案:E
(2013·四川省泸州市4月模拟)There was no signal in that faraway village and all my attempts ________ you failed.
A.to contact
B.contacting
C.contacted
D.having contacted
已知一次函数y=3x+b的图象经过(﹣1,2)和(a,﹣4),则a=( )