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一、巧妙的运输管道植物的茎是植物体所需营养物质的运输管道。有趣的是叶片所制造的有机物和根部吸收的水分及无机盐,并不是在一条通道上运输。根部所吸
First, the clever transport pipeline Plant stems are vegetative nutrients required by the transport pipeline. What is interesting is that the organic matter produced by the leaves and the roots absorb moisture and inorganic salts and are not transported in a single channel. The root sucked