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The phrase "a petroleum" is not correct in standard English usage.
It is typically used incorrectly because "petroleum" is an uncountable noun and does not require an article like "a" before it.
Example: "The company specializes in the extraction of petroleum from deep-sea reserves."
Alternatives: "petroleum product" or "a type of petroleum".
Exact(57)
"I'm a petroleum engineer.
A suburb has a petroleum refinery.
A petroleum distillate, however, is equally effective.
Kaufman is a petroleum industry expert.
"We're not a petroleum country anymore".
His father was a petroleum engineering consultant.
His father was a petroleum engineer.
Ms. Jewell previously worked as a petroleum engineer and banker.
Similar(3)
True Greek fire was evidently a petroleum-based mixture, however.
The balance of the material is a petroleum-derived plastic.
Curtis Kimbel, an Environmental Protection Agency coordinator, described the material as a petroleum-type substance.
More suggestions(2)
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CEO of Professional Science Editing for Scientists @ prosciediting.com