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10 particles 0. 3μm in size per cubic foot of air | |||
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1 particle 0.3μm in size per cubic foot of air | |||
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100 particles 0. 3μm in size per cubic foot of air |
级 净 化 : 11 phrases in 7 subjects |
Drilling | 1 |
Ecology | 1 |
Explosives and Explosive Ordnance Disposal | 1 |
Metallurgy | 2 |
Shipbuilding | 2 |
Technology | 3 |
Textile industry | 1 |