stereoscopic rangefinder 中文意思是什麼
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Derived from the 1929 fortress gun ( itself a development of the old 1897 field gun ) with a semi - automatic breech and an automatic loader added, the " high power " apx 75mm gun fired a mle 1915 he round with a reduced charge at 400 m / s and the mle 1915 ap round at 570 m / s ( 50mm penetration at 1000 m ) and its two sights and stereoscopic rangefinder allowed a direct fire range of 2000 m
「大威力」 apx型75毫米炮由1929型要塞炮（舊式1897型野炮的發展型）衍生而來，加裝了半自動炮尾和一個自動裝填器，發射減裝藥的1915型高爆彈（初速400米/秒） ，及1915型穿甲彈（初速570米/秒， 1000米距離可穿透50毫米裝甲） 。
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