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【判断题】
YJ-95型液压加速器冲程219mm。A.
正确
B.
错误
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where
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where
B.
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【简答题】在民用运输机上应用较多的是以 为基体。A. 树脂 B. 金属 C. 陶瓷 D. 碳基
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