【单选题】
按照粘度等级，我国将齿轮机油分为___个等级（易）
A. 4
B. 11
C. 7
D. 8
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答案
C
解析
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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( ) 29. When was canned food invented?
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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