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【单选题】
当讨论辛普森结构变速器时，技师甲说前行星架可以用作齿轮机构的输出元件；技师后齿圈可以用作齿轮机构的输出元件。谁正确？A.
甲正确
B.
乙正确
C.
两人均正确
D.
两人均不正确
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A.
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B.
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A.
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B.
错误
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A.
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B.
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C.
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D.
lube oil vapors in the engine room
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