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單項(xiàng)選擇題

CBG020壓桿式黃油搶在已排盡空氣仍然打不出潤(rùn)滑脂時(shí)，應(yīng)停止操作、并仔細(xì)檢查搶內(nèi)的，故障排除后，方可重新操作（）

A.油脂
B．拉桿
C．活塞
D．阻塞

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