“17－9 9”，比较大小，在 里应填的符号是（  ）

氢气和氧气的混合气体在0℃和一定压强下体积为a L，点燃后发生反应，待气体恢复至原来温度和压强时，测得其体积为b L，原混合气体中氢气和氧气的体积各是多少？（若将温度改为120℃则结果如何？）

给下列图片排序。    There are some special days in a year.New Year's Day is in January.Then Tree Planting Day comes after Women's Day.Children like June best.Because Children's Day is in June.Dragon Boat Festival (端午节) always comes after Children's Day.I like Children's Day，because I can play many games and get some gifts from my parents on that day.In September we have Teachers' Day.And in October，we have China's National Day.
 ____
 ____
 ____
 ____
 ____

在被子植物中，花、果实和种子往往作为分类的重要依据．

西汉时期，太学开设并讲解《易经》《诗经》《尚书》《礼记》《公羊传》《谷粱传》《左传》《周官》《尔雅》等课程。这反映出儒学教育（   ）