half mask

Respiratory protective devices-Compressed air line breathing apparatus for use with a full face mask, half mask or a mouthpiece assembly-Requirements, testing, marking.

呼吸保护装置。与全罩式面罩、半罩式面罩或口罩一起使用的压缩空气导管呼吸装置。要求、试验和标志。

A half mask covered his eyes.

半面具遮住他的双眼.

Half-mask respirator filtering respiratory protective devise for self-rescue from fire

半面罩式呼吸防护器消防过滤式自救呼吸器

Abiological protective respirator with equal protection level of the half face mask

一种达到面具防护水平的生物防护口罩

Study on sub-half-micron Cr mask fabricating technology

亚半微米铬掩模版制作技术研究

A loose hooded cloak worn with a half mask as part of a masquerade costume.

和作为舞会服装一部分的半截面罩一起穿戴的、有宽松头巾的斗篷。