Automobile Engineering in ME
The negative terminal post on the top of a battery is

Larger than the positive terminal post
None of the listed here
Smaller than the positive terminal post
Of the same size as the positive terminal post

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Automobile Engineering in ME
The function of a second ring is that it is a

Compression ring and aids the top ring in sealing and cooling
Back up compression ring which will work in place of the top ring when it is broken
Cushion ring which prevents piston slap and knock
Back up oil control ring which will work in place of the bottom ring when it is broken

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