[名词解释] 氮循环 nitrogen cycle
[名词解释] 有机物反应活性(organic reactivity)
[名词解释] 反应性氮中间产物(reative nitrogen intermediates,RNIs)
[名词解释] 土壤有机质平衡 soil organic matter balance
[名词解释] 次级基因库(gene pool2)
[名词解释] 三级基因库(gene pool 3)
[名词解释] 土壤有机质半减期 half-life of soil organic matter
[判断题] 在淡水水体,溶解有机氮是有机氮的主要形式A . 正确B . 错误
[单选题]E.lectric insulation is made of organic substances and so gradually______with ageA.deterioratesB.increasesC.are fouledD.becomes better