The Red Army soldiers had to fight ________ all kinds of difficulties in their fight ________ the people's freedom.
如图是DNA片段的结构图,请据图回答:
在证明DNA是遗传物质的实验中,赫尔希和蔡斯分别用32P和35S标记噬菌体的DNA和蛋白质,在下图中标记元素所在部位依次是( )