Please outline the composition principles for ascertaining a nutrient solutionformula.
请简要说明在确定营养液配方时的组成原则。
2
The suitable nutrient solutionformula was calculated according to the water quality in Beijing.
根据对主要大量元素的实际吸收情况，推算网纹甜瓜合适的营养液配方。
3
In this paper, using total differentiation method and variation of constants, we give general solutionformula of Bernoulli equation with different methods.