植株金属元素含量是农田环境质量评价中的必检项目。
The mass and trace metal element contents in the plant had to be measured in grade estimation of farm enviroment.
冷弯性能是热轧中薄板带材的重要指标之一，冷弯试验是标准规定的必检项目，但在实际生产中经常出现冷弯不合格现象。
The cold bending property is one of the important targets for the hot rolled strip, the cold bending test is required inspection item stipulated in the standards.
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