如图所示风洞实验室中可产生水平方�的大小可调节的风力.现将一套有小球的细直杆放入风洞实验室.小球孔径略大于细杆直径. 1当杆在水平方� Template




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tomski如图所示风洞实验室中可产生水平方�的大小可调节的风力.现将一套有小球的细直杆放入风洞实验室.小球孔径略大于细杆直径. 1当杆在水平方� coloring