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What does EVA stand for?

Eva stand
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What does EVA stand for?

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Lin Da

EVA (Technicaly named Ethylene Vinyl Acetate)

And the feature of Eva are: 
Water resistance: closed cell structure, non-absorbent, moisture, water resistance is good. 
Corrosion resistance: resistant the sea water, oils and fats, acid, alkali other chemicals, corrosion, anti-bacterial, non-toxic, tasteless, non-polluting…more

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EVA is a commonly used acronym for Extravehicular Activity, which describes any activity for which a crewmember must go outside the protected “shirtsleeve” environment of the orbiter’s crew cabin.

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