Pump body seal part of the series for two sets of mechanical seals, mechanical seal, code-named the upper part 60b, the lower mechanical seal, code-named 60a.
泵体部分的轴封为两套串联的机械密封，上部机械密封代号为60b，下部机械密封代号为60a。
Rotation of one gear, the driver causes the second, or follower gear, to turn. The driving shaft is usually connected to the upper gear of the pump.
第一个齿轮即主动轮的回转引起第二个齿轮即从动轮的回转。驱动轴通常连接到泵上面的齿轮上。
ObjectiveTo investigate the effects of analgesic pump on respiratory function in 40 upper abdominally operated patients with chronic obstruction pulmonary diseases (COPD).
目的探讨术后使用镇痛泵对慢性阻塞性肺病患者上腹部手术后肺功能的影响。
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