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Environmental Monitoring Station of Wuhu City, 241000, Wuhu, Anhui, China Abstract: Acidrain is one of the most serious environmental poll ution problems ,To resolve its chemicalcomposition and its rule of seasonal change will be hel pful in researching the cause ofacid rain and the method of acidification contr ol .

芜湖市降水化学成分特征及变化趋势的初步研究王小月张书贵摘要：酸雨是我国严重的环境题目之一，对其化学成份及其四季变化规律的分析、研究将有助于酸雨成因的探讨和酸化控制的研究。

DNA molecular weight standards are a mixture of a grou Pof DNA molecules with known sizes to reference the molecular weight of unknown DNA samples in nucleic acid electrophoresis and hel Pthe experimentalists to judge the property of the DNA samples.

DNA分子量标准是一组分子量大小已知的DNA片段混合物，用于指示核酸电泳中未知样品的分子量大小，从而帮助实验人员判断DNA样品的性质。

These patterns were hel d i n l arge mi neral s that were grown i n l aboratori es for thi s purpose and then i mported unto Earth from the Pl ei ades.

这些模式用大量矿石进行维持，那是专为这个目的在实验室里制造出来并随后从昴宿星进口到地球上的。

In 1952 he was jailed with Govan Mbeki and Raymond Mhlaba for three months in Rooi Hel ('Red Hell' or North End Prison, Port Elizabeth) for participation in the 'Campaign of Defiance against Unjust Laws'.

他于1952年被判入狱的戈万姆贝基和雷蒙德 Mhlaba 三个月在 Rooi 海尔（'红地狱或北端监狱，伊丽莎白港）参加'运动对不正当蔑视法律的。

Foods high in this vitamin include oily fish such as salmon, tuna and, and fish liver oils.

维生素D含量高的食物包括诸如大麻哈鱼、金枪鱼和鲭鱼之类的油鱼以及鱼肝油。

We need you to cosign our public letter demanding that press intimidation cease immediately, and that all charges be dropped.

我们需要您cosign我们的公共信，要求记者立即停止恐吓，并要求所有收费下降。