Objective:To reduce the mental pressure, avoid micro-air from entering blood vessel during vein injection and prevent the complications.
目的：减少患者心理压力，避免微量空气在静脉注射药液时进入血管内，预防并发症发生。
The effect of back pressure on the weight precision in injection molding was investigated via experiments of injecting to air.
通过对空注射方式对影响精密制品质量重复精度之一的背压进行实验和理论研究。
The effect of back pressure on the weight precision in injection molding was investigated via experiments of injecting to air.
通过对空注射方式对影响精密制品质量重复精度之一的背压进行实验和理论研究。
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