作为基准物质，必须具备的条件是（）。
A、有足够的纯度
B、实际组成与化学式完全相符
C、性质稳定
D、摩尔质量较大
参考答案：A, B, C, D
肾移植病人开放血管时血压宜维持于较高水平，主要采取（）
A.静滴多巴胺
B.α受体兴奋药
C.β受体兴奋药
D.α和β受体兴奋药
E.减浅麻醉
Following a precipitous delivery, examination of the client’s vagina reveals a fourth-degree laceration. Which of the following would be contraindicated when caring for this client（）
A. Applying cold to limit edema during the first 12 to 24 hours.
B. Instructing the client on the use of sitz-baths if ordered.
C. Instructing the client about the importance of perineal (Kegel) exercises.
D. Instructing the client to use two or more peripads to cushion the area.
