即便空气污染物的浓度相对偏低，它也与一系列的健康副效应相关。
Even relatively low concentrations of air pollutants have been related to a range of adverse health effects.
最后一个展厅挂着119副毕加索《347套房》系列版画、凹版腐蚀制版画和铜版画。 这些作品创作于艺术家逝世前五年的1968年。
The last room is hung with 119 prints from Picasso’s Suite 347, aquatints and etchings made in 1968, five years before he died.
本文介绍了滚动花键副的结构、工作原理、特点、系列和尺寸及其选用计算。
This article presents the principle and construction of spline pair with rolling contact, and also introduces their features, applications, series, dimensions and selecting calculations.
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