Chlorophyll content and biomass of plants are usually increased by the addition of certain amount of ammonium to the nutrient solution.
在营养液中添加一定量的铵态氮能提高作物生物量和叶绿素含量。
In addition to the handling fee, you still need to pay a certain amount of commission for each transaction.
除手续之外，你还要为每次交易支付一定的佣金。
In addition, certain amount of test data of submersible motor pumps is also provided, so that above analysis method and formulas are checked.
此外还提供了一定数量的潜水电泵的试验数据，从而验证了上述的分析方法和各项公式。
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