Minimum alveolar concentration (MAC) before and after operation was recorded.

记录术中最低肺泡内有效浓度(MAC)。

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The cover of the pump guarantees a minimum noise level during operation.

泵盖保证运转时噪音处于最低水平。

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The cover of the pump guarantees a minimum noise level during operation.

泵盖保证运转时噪音处于最低水平。

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