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Source channel @pushgoodcloud · Post #607 · 11月30日

#Lantau#大屿山 之前购买过的,可以联系 @ljfxz 退款,直接发机场邮箱给他 剩余价值退款按照( 剩余时长*时长单价)+(剩余流量*流量单价)的形式退款 流量单价=套餐价格*0.8/套餐流量总数 时长单价=套餐价格*0.2/套餐时长总数 例如轻量套餐价格为9元,流量为80G,时长为30天。那天数单价为(0.2*9)/30,流量单价为(0.8*9)/80。 此时轻量用户还剩10天,流量还有70G,那退款为10*[(0.2*9)/30] + 70*[(0.8*9)/80] 注* 充了流量的钱也可退

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djangoproject

@djangoproject · Post #533 · 2017/12/21 14:21

http://greenteapress.com/wp/modsimpy/ Free Book: #Modeling and #Simulation in Python Modeling and Simulation in Python is an introduction to physical modeling using a #computational approach. It is organized in three parts: The first part presents discrete models, including a bikeshare system and world population growth. The second part introduces first-order systems, including models of infectious disease, thermal systems, and chemical kinetics. The third part is about second-order systems, including mechanical systems like projectiles, celestial mechanics, and rotating rigid bodies.