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。
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。
Working principle of speed change box sliding table is the longitudinal motion on the bed. Because the lead screw drive, couple with the function of gear box.
变速箱式滑台工作原理是滑板在床身上做纵向运动，因其丝杠传动，再加上变速箱的作用。
Working principle of speed change box sliding table is the longitudinal motion on the bed. Because the lead screw drive, couple with the function of gear box.
变速箱式滑台工作原理是滑板在床身上做纵向运动，因其丝杠传动，再加上变速箱的作用。
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