题目内容
(请给出正确答案)
[单选题]
韶山4型电力机车油压减振器涨圈开口在自由状态下小于()时候应更新。
A.7mm
B.6mm
C.5mm
D.4mm
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A.7mm
B.6mm
C.5mm
D.4mm
A.1.5mm-1.5mm-1.5mm
B.14mm-1.5mm-1.5mm
C.1.5mm-14mm-1.5mm
D.14mm-1.5mm-14mm