本文提出了研制离子交换纸的设计技术指标。
They had gone to quite enough expense as it was, stripping the old parer off.光是剥掉旧纸一项费用已经很可观了。
Applying period frequency spectrum method to analysis of digital seismic recording is discussed in this parer.论述了周期-频度谱方法在分析数字化地震记录中的应用。