Research progress of lead-free solder, invalidation models of solder joint, solder joint reliability evaluation and the defects of solder joints in recent years have been reviewed.
笔者就近年来国内外开发的无铅焊料、焊点的失效模式、焊点可靠性评价方法和焊点的主要缺陷进行了综述；
Methods 312 patients were treated by joint replacement in 6 years, the evaluation of infection and measures to prevention infection during the surgery were studied by a follow-up survey.
方法追踪分析该院6年内已进行的312侧人工关节置换术患者术前、术中和术后预防感染的评估方法、措施和观察方法。
Compared with the evaluation method of entropy and joint entropy, it was shown that mutual information was a good evaluation criterion.
通过将它与采用熵和联合熵的评价方法相比较，实验结果表明交互信息量是一种很好的评价方法。
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