In welding zone the lath shape microstructure reduces, and equiaxed microstructure increases.焊缝区在经过长时运行后板条状组织减少, 等轴状组织增多.Firstly, equiaxed microstructure could be produced by treatments including hot compression and dupl...
A tiny insect , trying to shake a mighty tree, is ludicrously ignorant of its own weakness.蚍蜉撼大树, 可笑不自量.She caught the insect by inverting her cup over it.她用杯子扣住了那只昆虫.The males of many species of insect have similarly el...