【简答题】某课外活动小组为探究CO 2 与过量的NaOH溶液确实发生了化学反应,甲、乙、丙三位同学设计了下列三种实验装置,请回答下列问题: (1)甲装置中CO 2 与过量的NaOH反应的离子方程式______. (2)丙装置实验现象是______,解释产生该实验现象的原因______. (3)甲、乙、丙同学设计的三个方案中,有一个方案在实际操作中安全性存在问题,该方案是______ (填甲、乙或丙),原因是...
【简答题】What are people’s views on money? Spend it or save it? Why?
【多选题】根据担保法的规定,可以抵押的财产包括( )。
【简答题】A.They learned to save as thrifty as their parents. B.They spend money quickly and impulsively to avoid higher prices. C.They put most of theft money into their savings accounts. D.They spend some mon...
【单选题】下列关于过氧乙酸的说法正确的是( )
A.
过氧乙酸分子式为C 2 H 4 O 3 ,易溶于水,是一种有机羧酸
B.
过氧乙酸是一种强还原剂,杀菌作用强,有腐蚀性
C.
过氧乙酸原液应保存于塑料桶内,在阴暗处保存,并要远离可燃物
【单选题】对培养幼儿社会适应能力起决定性作用的社会性凶素是( )。
【简答题】A.They learned to save as thrifty as their parents. B.They spend money quickly and impulsively to avoid higher prices. C.They put most of theft money into their savings accounts. D.They spend some mon...