用新的方法把一些观点和实物进行对比和联系。
通过简述国内外ERW钢管的应用状况以及具体实例对比，分析了国内ERW钢管实物质量与国外产品的差距以及产生的原因。
Through the contrast between national ERW pipe application and detail case with foreign country, the article analyzes the difference of national ERW pipe quality and oversea and its causes.
计算机模拟和实物的对比实验表明，该方法能有效地提高反向条纹投影的精度。
Through comparison of experiments using computer stimulation and a real object respectively, a conclusion is gotten that this method can improve precision of inverse fringe projection effectively.
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