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HELP I HAVE 20 MINUTES What was the first advance in refrigeration technologies in the 1800s?

1 A US patent for refrigeration was filed.
2 A practical refrigerated train car was built.
3 A refrigerated ship transported meat by sea.
4 A refrigerated food storage plant was built.


Sagot :

Answer:

D

Explanation:

Answer:

2

Explanation:

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