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mumapiaoyun:差動螺紋 (2013-07-30 20:27) 2@GizT*mA
yu-xuegang:改變AB鏡組的空氣間隔。 (2013-07-30 17:00) `<X-3)>;G
seaman:你覺得A和B的兩端螺紋不同 <$(B