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关注：1
2013-05-23 12:21
求翻译：Use a NIOSH approved respirator appropriate for exposure to silica dust and the other relevant conditions of use if dust levels are above exposure limits. Half-masks are usually sufficient for normal use是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
Use a NIOSH approved respirator appropriate for exposure to silica dust and the other relevant conditions of use if dust levels are above exposure limits. Half-masks are usually sufficient for normal use
问题补充： |
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2013-05-23 12:21:38
正在翻译，请等待...
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2013-05-23 12:23:18
a respirator Use NIOSH approved for appropriate exposure to silica dust and other relevant conditions of use if the dust levels are above exposure limits are usually sufficient . Half - masks for normal use
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2013-05-23 12:24:58
Use a NIOSH approved respirator appropriate for exposure to silica dust and the other relevant conditions of use if dust levels are above exposure limits. Half-masks are usually sufficient for normal use
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2013-05-23 12:26:38
正在翻译，请等待...
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