method of variation of parameters是什么意思

conditional coefficient of variation是什么意思 Variation of travel conditions是什么意思? method of joints是什么意思 think.of.method是什么意思 method of analysis-synthesis是什么意思 method of demonstration汉语是什么意思 method of comparative analysis是什么意思 method of undetermined coefficients是什么意思 variation of above Variation proportion of groundwater cannot call method "open" of undefined是什么意思 calculus of variation什么意思?