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颗粒粒度测量方法有筛分法、沉降法、比表面法、显微镜法、电阻变化法、光的散射与衍射法等。
答案：
颗粒粒度测量是工业和科学研究中的一项重要技术，用于确定固体颗粒的大小分布。不同测量方法适用于不同类型的颗粒和不同的粒度范...
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翻译练习（一） 22 May 2020 Dear Sirs, Thank you for your letter of the 20th of this month. We shall be glad to enter into business relations with your company. In compliance with request, we are sending you, under separate cover, our latest catalogue and price list covering our export range. Payment should be made by irrevocable and confirmed letter of credit. Should you wish to place an order, please Email or fax us. Yours sincerely, Tony Smith Chief Seller
翻译练习（一） 22 May 2020 Dear Sirs, Thank you for your letter of the 20th of this month. We shall be glad to enter into business relations with your company. In compliance with request, we are sending you, under separate cover, our latest catalogue and price list covering our export range. Payment should be made by irrevocable and confirmed letter of credit. Should you wish to place an order, please Email or fax us. Yours sincerely, Tony Smith Chief Seller
答案：
2020年5月22日尊敬的先生们，感谢您本月20日的来信。我们很高兴能与贵公司建立业务关系。按照要求，我们另函寄上我们最...
