Doctor or teacher or an engineer
Answer:
Mainframes
Explanation:
Mainframes are utilized by many major corporations and government agencies. They are also used in banking, accounting, and healthcare to name a few.
How about you prefer no class
Fist one correct.
second wrong because not all heat is used for work, some of it lost to other.
third wrong because fuel burn inside is called combustion engine
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A reputable website would be one that you could research online and read about it's history , reviews etc .
