【单选题】苏联 2000 万农户中原来大约有四分之一农户不养奶牛,到 1959 年,几乎每个农户都养了奶牛,此外,城镇居民还养了 350 万头奶牛,全国牛奶产量明显增加。几年内,羊的头数增长了一倍,猪和家禽的数量也大大增加。这主要是基于时期 ( )
【单选题】----We could have come here much earlier in your car. ----I agree. But it _____.
【简答题】在 1 个大气压, 96°C 时 , 苯的饱和蒸气压 P A 0 = 160.5kPa, 甲苯的饱和蒸气压 P A 0 = 65.66kPa, 苯 -- 甲苯混合溶液达于平衡时 , 液相组成 x A = ,气相组成 y A = ,相对挥发 α= 。
【单选题】单项选择。 — Could you come here, please? — . [ ]
【单选题】--Kelly, could you come here, please? I need some _______. -- Ok, I’m coming.
【单选题】--Could I come here again tomorrow? --Yes, you_____