Historians use a wide range of primary and secondary sources for their research.
历史学家在研究中使用大量的原始资料和二手资料。
Various sponge and PVC materials such as metal forming, and the range of products that use a wide range of high quality.
各种海棉、PVC等材料冲压成型,产品种类繁多,用途广泛,质量优良。
A second approach is to use a wide range of sequential frequencies; this is easier to match but more prone to interference.
第二种方法是使用一种有序的多波段发生器,这样可以更容易的匹配回波信号,但同时也更易受到干扰。
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