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【单选题】
造成轴瓦的异常磨损是由于______使润滑油膜遭到破坏所致。
A.
磨粒；Ⅱ.轴颈表面太粗糙；Ⅲ.轴颈表面状态不良；Ⅳ.违章操作；Ⅴ.轴承负荷过大。
B.
Ⅰ＋Ⅱ＋Ⅲ＋Ⅳ＋Ⅴ
C.
Ⅰ＋Ⅳ
D.
Ⅱ＋Ⅳ＋Ⅴ
E.
Ⅱ＋Ⅴ
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