I came across the picture below and saw the hole near the centerline on the left which appears howto have some carbon next to it. What is it'sits purpose and where does the carbon come from?
Copy edited. [(its = possessive, it's = "it is" or "it has". See for example <http://www.wikihow.com/Use-Its-and-It%27s>.)]
I came across the picture below and saw the hole near the centerline on the left which appears how have some carbon next to it. What is it's purpose and where does the carbon come from?
I came across the picture below and saw the hole near the centerline on the left which appears to have some carbon next to it. What is its purpose and where does the carbon come from?
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