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mumapiaoyun:差动螺纹 (2013-07-30 20:27) r,;\/^ u*
yu-xuegang:改变AB镜组的空气间隔。 (2013-07-30 17:00) Es4qPB`g.
seaman:你觉得A和B的两端螺纹不同 #1nJ(-D+ 然后转动中间的零件,可使A/B的相对位置发生变化? (2013-07-30 22:02) ]ZoPQUS?
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