A few even bounced straight back at the observer, which Rutherford said was as unexpected as firing a cannon shell at tissue paper and having it come back and hit you.

甚至极少数发生大角度的散射，卢瑟福后来回忆说：“这是我一生中从未有的最难以置信的事，它好比你对一张纸发射出一发炮弹，结果被反弹回来而打到自己身上。”

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In this paper, a multi-grade image recognition plan is proposed for inner-surface rifling images of a cannon and an arithmetic method for rifling recognition is also designed.

提出了一种线膛炮内膛表面图像识别的分层次识别方案，并研究了膛线识别的算法。

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In this paper, by analysing a practical spares support model of cannon spares support sys-tem, a practical optimum algorithm-the marginal analysis is presented.

本文通过对一种较实用的火炮备件保障系统保障度模型进行分析，提出了一种比较实用的最优化求解算法——边际分析法。

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