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1. 设 是区间 上 的连续函数 , 在线性空间 上定义二元函数:

1. 设 U(t)! 0 是区间 [a,b] 上 的连续函数 , 在线性空间 C [a,b] 上定义二元函数: ( f , g ) (s) f (s)g (s)ds , f , g C [a , b] b a U ³ U 证明: (C [a,b], ( , ) U) 是 ... ... Read more

Directory of Water and Wastewater, Air Pollution Control ...

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Frequently Asked Questions | Wood Salad Bowls & More | …

Get expert answers to frequently asked questions regarding the product benefits and care of wooden bowls, cutting boards and other wooden kitchenware. ... Read more

Storage Tanks and Silos - manufacture & design - Spirotech

Spriotech-SRD design and manufacture a wide range of storage tanks and silos, designed and fabricated to exacting industry standards. ... Read more

7 Best and Worst Sugar Substitutes - TotalBeauty

7 Best and Worst Sugar Substitutes A sugar substitute can help keep you in your skinny jeans, but it may be harming your health. Here's the scoop on the best -- and ... ... Read more