外鼻静脉描述有误的是()
A.主要包括内眦静脉和面静脉
B.内眦静脉直接与海绵窦相同
C.无瓣膜
D.主要汇入颈内静脉
E.以上都错
参考答案：B
The physician orders IV fluid volume replacement with lactated Ringer's solution at a rate of 75 mL/hour. Using an infusion set that provides 15 gtt/mL, the nurse should calculate the flow rate to be （）.
A．10 gtt/min.
B．12 gtt/min.
C．19 gtt/min.
D．75 gtt/min.
纯化装置在检修后或备用时间超过一个月时，总启动前应做好哪些工作？
