Objective To analyse the onset of thyroid nodule, discuss the induction of thyroid nodule diagnosis inspection method, the principle, operation methods and the prevention of complications.
目的分析甲状腺结节的发病情况，探讨归纳甲状腺结节的检查方法、诊疗原则、手术方式及并发症的预防。
The design principle and realization method of a new kind of radiographic welding seam inspection system for steel tube were introduced.
介绍了一种应用于钢管焊接接头检验的射线透视系统的设计原理与实现方法。
And there is the last standard in the inspection of packaging, the principle of economy.
最后检验包装还有一条标准，那就是经济原则。
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