在农田中施用某种农药防治害虫使用年数越长效果越差.下列对这一现象的解释中正确的是 A农药的质量越来越差b农药使害虫�生了抵抗 Template




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tomski在农田中施用某种农药防治害虫使用年数越长效果越差.下列对这一现象的解释中正确的是 a农药的质量越来越差b农药使害虫�生了抵抗 coloring