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当前学科：船舶辅机(大管轮)
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直控顺序阀和溢流阀通常：①前者外部泄油，后者内部泄油；②前者进出口油压差小，后者大；③前者控制阀后压力，后者控制阀前压力。上述说法对的是（）。
A . ①③
B . ②③
C . ①②
D . ①②③
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