When the other condition is the same, wave time for ultrasonic wave pass through the good and the flaw CFST are different, this thesis is based on theoretical principle to start the research.
当其它条件相同时，超声波通过有缺陷的钢管混凝土和无缺陷的声时值不相同，本文即以次为理论基础，开展研究。
From the time when his pen name "Luxun" comes into being, its celebrity and implication, the thesis probes into the life of Luxun.
文章从“鲁迅”笔名出现的时间、知名度和涵义，探讨作家鲁迅的人生道路。
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