大沟（major groove)和小沟（minor groove)

What led you to select your major？ You minor？

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What led you to select your major？ You minor？

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What are your major subject and minor subjects？

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What are your major subject and minor subjects？

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Each journal and pin should be examined for _____ and grooving.A.bridgesB.recessesC.rearsD

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Ring groove inserts are occasionally used on aluminum alloy piston to_______.A.reduce the

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If the piston groove drain holes for the oil control rings become clogged, which of the fo

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