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一、引言 在高速弹撞击钢板形成的弹坑附近切取一些金相试样,经磨制腐蚀后,放到金相显微镜下观察常常可
I. INTRODUCTION In the vicinity of a crater formed by a high-speed projectile impact plate, a number of metallographic specimens are cut, and after being etched and etched, it is often observed under a metallographic microscope