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Usually, the hydraulic fluid flows into the valve through port a and out through port b.

AA. 通常，渗透油从A口流入活门，从B口流出。

BB. 通常，液压油从A口流入活门，从B口流出。

CC. 通常，滑油从A口流入活门后流经B口。

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正确答案：A （备注：此答案有误）

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