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【单选题】
通常，十字头机与筒形活塞式柴油机的曲轴箱油所要求的质量等级______。A.
均为CB级
B.
分别是十字头机为CB级，筒形活塞机为CD级
C.
分别是十字头机为CD级，筒形活塞机为CB级
D.
均为CD级
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