农业生产上所说的肥料的三要素是指[]A．氮、磷、铁B．氮、磷、钾C．氮、磷、镁D．氮、磷、钠-七年级生物

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• Not only ______ strict with us, but also ______ for us .A．was the teacher ; did he care B．was the t
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• He’s only too ready to help others, seldom, _____ refusing them when they turn to him.A．if everB．if
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• 下列哪一项农业措施最能体现目前现代化的生产[]A．合理灌溉B．合理施肥C．根外施肥D．无土栽培-七年级生物
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