Soil enzyme activity varied obviously with duration of vegetable plantation and could be cited as a sensitive indicator of changes in soil quality.
不同利用年限菜地土壤酶活性变化幅度较大，能够更为敏感的指示土壤质量的变化。
To determine the free fatty ac id in vegetable oil with NaOH's standard titration solution, using Thymol Blue as its indicator.
以百里酚兰为指示剂，用氢氧化钠标准滴定溶液测定植物油中游离脂肪酸。
[Methods] to determine the free fatty ac id in vegetable oil with NaOH's standard titration solution, using Thymol Blue as its indicator.
[方法]以百里酚兰为指示剂，用氢氧化钠标准滴定溶液测定植物油中游离脂肪酸。
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