根据水质评价的特点，针对上述BP网络结构，水质评价的训练样本为相应的水质分级标准，即网络输入为相应水质标准中各指标标准值，网络的希望输出为相应标准值组对应的水质等级。-According to the characteristics of water quality assessment for the BP network structure, the quality assessment of training samples to the corresponding water quali