alternating pressure

Three-phase alternating frequency modulation control signal produced by 8051 CPU is magnified to control the switch of the silicon controlled rectifier in inverse main bridge circuit, thereby constant pressure speed-adjusting is realized.

由8051CPU产生三相交流调频控制信号，经放大来控制逆变主桥路中可控硅晶闸管的通断，从而实现恒压调速。

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the clinical effects of alternating pressure relief bed mattress in prevention of pressure ulcer

波浪床预防压力性溃疡的临床研究

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tiptoe around to the side a step, hands and knees, or so knock knees alternating pressure 36 times.

脚尖向两侧左右大开步，双手扶双膝，左右交替叩压膝36次。

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The temperature regulator tube plate and steel tube beam work in the frequent change of temperature for a long time, their high alternating pressure make the tube plate's weld crack and tube beam leak.

减温器管板和钢管束长期工作在频繁变化的温度中，交变压力很大，造成管板焊缝处经常开裂，管束泄漏。

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alternating pressure pads or pumps

交互式压力垫或压力泵

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Randomised, controlled trial of alternating pressure mattresses compared with alternating pressure overlays for the prevention of pressure ulcers: PRESSURE ( pressure relieving support surfaces)-trial

气垫床垫与气垫床罩预防压力性溃疡的随机、对照试验：PRESSURE（减压支持表面）试验

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and overlay of both alternating pressure, will become the physical and mental diseases constitute an important factor.

两者的交替出现及叠加的压力，将成为构成身心疾病的重要因素。

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specification for alternating pressure air mattresses

交变压力气垫规范

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