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【单选题】
某管理局车库里有6个油桶，分别汽油、柴油和机油。其重量为31升、凹升、19升、 18升、16升、15升。已知六桶油中有一桶汽油，柴油比机油多一倍。请问柴油是多少?
A.
49升
B.
50升
C.
66升
D.
68升
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