在水或规定的释放介质中缓慢的恒速或接近恒速释放药物的颗粒剂是（）
A．混悬颗粒
B．泡腾颗粒
C．肠溶颗粒
D．缓释颗粒
E．控释颗粒
参考答案：E
静息电位大小接近于
A．氯平衡电位B．钠平衡电位C．钾平衡电位D．钙平衡电位E．钠平衡电位与钾平衡电位之和
Each year in the United States, many black teenagers（）of school, either because they cannot keep up or they have to work to support their family.
A.go out
B.drop out
C.check out
D.pull out
