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An often overlooked function of oil is ring and valve sealing.
一个经常被忽视的功能是环和油阀密封。
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The primary function of sealing gasket is to prevent gas from leakage.
密封垫圈的主要作用是防止气体泄漏。
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Sealing ring must maintain good function.
密封圈必需保持良好的机能。
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Sealing ring must maintain good function.
密封圈必需保持良好的机能。
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