The mass and trace metal element contents in the plant had to be measured in grade estimation of farm enviroment.

植株金属元素含量是农田环境质量评价中的必检项目。

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The mass and trace metal element contents in the plant had to be measured in grade estimation of farm enviroment.

植株金属元素含量是农田环境质量评价中的必检项目。

youdao