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seaman:你觉得A和B的两端螺纹不同 ;t@^Z_z,CR 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) t)(>E'X x
yu-xuegang:改变AB镜组的空气间隔。 (2013-07-30 17:00) V%J_iY/BUb
mumapiaoyun:差动螺纹 (2013-07-30 20:27) ,[ M^rv