皮皮学，免费搜题
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【单选题】
型号为310的滚动轴承，其轴承内径为（）。A.
10mm
B.
20mm
C.
50mm
D.
100mm
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A.
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B.
进入本行业可以产生明显的协同效应的企业
C.
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D.
通过后向或前向一体化进入本行业的买方或供方
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A.
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B.
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A.
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B.
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C.
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D.
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