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【单选题】
环槽下端面过渡磨损后呈倾斜状,会导致活塞环在柴油机运行周期性地( )变形而疲劳断裂。A.
扭曲水平
B.
弯曲水平
C.
扭曲弯曲
D.
胀缩弯曲
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A.
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B.
There'will soon be an energy crisis
C.
Conventional reserves will soon become inaccessible
D.
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