direct variation和inverse variation是什么意思?

direct variation和inverse variation是什么意思? variation 翻译direct line和direct service provider direct selling 和direct marketing 急 variation和change(n.)的区别? variation,change,fluctuation的区别和联系 INV.NO 和 P/I NO INV.NO 和 P/I NO Direct direct direct和straight的区别 stright和direct的区别 看不懂英文啊 T T state whether or not each equation defines a direct variation .for each direct variation ,state the constant of variation.1,y=3x 2,p=4/q (这些只给一个数,看不懂……）---------state whether or not formula shows a dir 请问variation和variety的辨析?这是高二的单词～ 英文文献中“variance”和“variation”的区别是什么 质量管理中：short term variation instability 和a long term cell-to-cell variation 和 phenomenological fit 怎么翻译? windows科学型计算器中inv和hyp的意思?