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下列说法正确的有（）
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BSP法中，定义数据类时最重要的是关联数据类与（）
Only when（）my hometown（）how much I loved my parents.
Woman:Do you have any suggestions?Man:Well,I’ll （26） in stores or supermarkets.First of all,make a list,and stick to it.With a shopping list,you know exactly what you need and can avoid buying those things you don’t need.Woman:OK.Rule number one,（27）.Man:Secondly,（28）.Before going out,figure out how much money you need based on your shopping list.To stop yourself buying unnecessary things,do not bring too much money.Woman:Hmm,that will definitely work for me.So rule number two,bring money that’s just enough to cover your needs.Man:Next,（29）.In both situations,you focus on finishing shopping quickly rather than on thinking carefully whether you need to buy an item or not.Woman:Fair enough.Don’t buy when you have limited time.Man:Lastly,（30）.The more time you spend in a store or supermarket,the more you’re likely to buy. 27（）
将1.95gNa2SO4和Na2CO3的混合物溶于水得到溶液A。在A中加入足量一定浓度的BaCl2溶液10.0ml，然后过滤得沉淀B和滤液C。在C中加足量AgNO3溶液，又生成5.74g沉淀。向B中加入足量稀硫酸，沉淀增加0.18g。 计算氯化钡溶液的物质的量浓度
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