To understand the effect of the transfusion speed on the cardiac function recovery after operation by comparing the heart rate change between two groups.
通过比较两组患者心率变化，了解输液速度对心脏功能恢复的影响。
The device also has the function of speed change from high to low.
该装置还具有由高速向低速转换的功能。
A new change over mechanism design of differential speed and its main function and structural characteristic are introduced.
介绍了一种新型差速转向机构的设计，对其主要功能、结构和特点进行了分析。
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