如果你有打吊针输液的经历，你一定有这种感受，输液速度过快，感到酸痛，心跳加快；输液速度过缓，则输液时间较长．因此，在整个输液过程中保持药液匀速滴下就显得非常重要．假如你是一个护土，根据大气压知识，进行输液时应采取图1所示A、B、C、D中哪种装置？输液时要让药液 If you have experience with hanging needle infusion, you must have this feeling, infusion speed is too fast, feel sore, heart rate is accelerating; infusion speed is too slow, the infusion time is longer. Therefore, it is very important to keep the liquid dripping at a uniform rate throughout the infusion process. If you are a soil-retainer, according to atmospheric pressure knowledge, which of the devices A, B, C, and D shown in Figure 1 should be used for infusion? Infusion solution to let the liquid