After 2000, the country's metal-bashers somehow managed to raise their productivity growth by another notch, to 5.1% a year, according to the Bureau of Labour Statistics.
The filtrating core is made by stainless steel notchmetal by enwinding , with high intensity and resistance for corrosion; therefore, it can be used permanently unless it is damaged physically.
滤芯采用不锈钢凹口金属线缠绕而成，其强度高且具有优良的耐腐蚀性。
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By taking the rectangular metal patch on a printed circuit board as the radiation element and by cutting a C-shaped slot in the rectangular patch, a frequency band notch is implemented.