Neck de-tenser Lie on your stomach, elbows on floor. With eyes closed, cup chin with your left palm and support the back of your head firmly with right hand.
放松颈部动作俯身卧倒，腹部着地，双肘着地，闭上双眼，左手掌呈杯状托着下巴，右手用力扶着头后部。
According to nation criterion of petroleum products determination of flash point with closed-cup method (GB/T261), an entire auto controlled intelligent PPCFP testing system is designed.
根据国家石油产品闭口杯法闪点检测标准（GB/T261），本文设计了一套完整的、自动化、智能化的石油产品闭口闪点检测系统。
According to nation criterion of petroleum products determination of flash point with closed-cup method (GB/T261), an entire auto controlled intelligent PPCFP testing system is designed.
根据国家石油产品闭口杯法闪点检测标准（GB/T261），本文设计了一套完整的、自动化、智能化的石油产品闭口闪点检测系统。
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