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mumapiaoyun:差动螺纹 (2013-07-30 20:27) :By?O"LQ
yu-xuegang:改变AB镜组的空气间隔。 (2013-07-30 17:00) I CZ4A{I
seaman:你觉得A和B的两端螺纹不同 (>F%UY 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) aF)1Nm[
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