心房易颤期发生在（）。
A.P波中
B.R波升支中
C.R波降支中
D.T波升支中
E.T波降支中
参考答案：C
一、二类疫苗代表什么意思？
A client has sustained a right tibial fracture and has just had a cast applied. Which instruction should the nurse provide in his cast care
A．Cover the cast with a blanket until the cast dries.
B．Keep your right leg elevated above heart level.
C．Use a knitting needle to scratch itches inside the cast.
D．A foul smell from the cast is normal.
