头盔内有氧气循环流动，除了供氧，还可以防止面罩雾化。
Oxygen is circulated around the helmet to stop the visor misting.
头盔内有氧气循环流动，除了供氧，还可以防止面罩雾化。
L Oxygen is circulated around the helmet to stop the visor misting.
船用便携式医用吸氧器，内有氧气，压力12kpa，附有呼吸面罩，中英文用法说明。
Marine portable medical oxygen, and there are oxygen, pressure 12kpa, with breathing masks, instructions in both English and Chinese.
船用便携式医用吸氧器，内有氧气，压力12kpa，附有呼吸面罩，中英文用法说明。
Marine portable medical oxygen, and there are oxygen, pressure 12kpa, with breathing masks, instructions in both English and Chinese.
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