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3 votes
Explain why machines are never 100% efficient.

User Nelli
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4 votes
there can be problems like not functioning well and today technology does them better 
User AJ Gregory
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idk what unit youre on so idk if i can give you the "right" answer but they rely on the automatic parts all to function properly and if one part happens to malfunction, the whole process could fail
User Kalimantan
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