某酸性溶液中只有Na+、CH3COO-、H+、OH-四种离子。则下列描述正确的是
A:该溶液由pH=3的CH3COOH与pH=11的NaOH溶液等体积混合而成
B:该溶液由等物质的量浓度、等体积的NaOH溶液和CH3COOH溶液混合而成
C:加入适量NaOH,溶液中离子浓度为c(CH3COO-)>c(Na+)>c(OH-)>c(H+)
D:加入适量氨水,c(CH3COO-)一定大于c(Na+)、c(H+)之和
如图所示,四个相似的计时器,成功记录下短跑时间的是( )
Don't throw away some old things.We can____them.We can put our pens and pencils in____.They will be nice____.We can put flowers in some bottles;they will be nice____.We can stick some____together and put our cards in them.How interesting!