本文分析了光学系统在小口径舰炮射击激光模拟器中应用的必要性。
In the paper, the necessity of the application of an optical system to the laser simulator for small calibre naval guns is discussed.
警方说事件发生前，29岁的孪生姐妹正在丹弗南部的一个室外射击场练习小口径手枪。
Police say the sisters, 29, were practising with small-calibre guns at an outdoor shooting range south of Denver for 90 minutes before the incident happened.
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