丙吡胺的作用机制是（）
A.抑制钠内流
B.抑制钙内流
C.促进钾内流
D.阻断β受体
E.延长动作电位时间
参考答案：A
A multigravida in her 34th week of gestation presents in the emergency department complaining of vaginal bleeding. Which of the following should be the nurse's first action ？（）
A．Establish IV access.
B．Assess fetal heart rate (FHR) and maternal blood pressure.
C．Prepare the client for a cesarean delivery.
D．Assess maternal heart rate and respiratory rate.
某日籍轮船在我境内港口卸货后，将扫仓地脚和废旧物料卸地处理，由船舶负责人口头通知海关。按照有关规定，境内接受单位可免税进口。( )
