The delamination crack and its effect on the fracture of pipeline steel were investigated by drop-weight tear test(DWTT)at different temperature and micrograph analysis.

通过对管线钢不同温度的落锤撕裂试验和微观断口分析，研究了DWTT试样断口的分层裂纹及其对断裂的影响。

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This study aimed to evaluate the effect of caries removal and clinical feature with Carisolv by using scanning electron micrograph, light micrograph, shear bond strength test.

本实验对伢典化学机械去龋法进行了扫描电镜、光镜、粘结效果、临床应用等研究，以评价伢典化学机械去龋法的疗效。

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