...oxygen-enriched aircrew breathing gas 释义：飞行人员富氧呼吸气 positive-negative pressure breathing 释义：正负压呼吸 tube for infant,corrugated breathing 释义：婴儿用橡皮螺纹呼吸管 ..
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intermittent positive negative pressure breathing 间歇性正负压呼吸
PNPB positive negative pressure breathing 正负压呼吸
positive negative pressure breathing 正负压呼吸
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