with the help of dogs ,many people(l.)in snow found their wayhome

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• with the help of dogs ,many people(l.)in snow found their wayhome填空
• Dogs have been man's good friends for t______ of years.Many stories told how brave dogs helpedpeople in t______.With the help of dogs,many people l______ in snow found their way home.Dogs have also helped in many scientific researches(科学研究).The first spacetraveller was a dog n______ Laika.It was sent up in a manmade satellite(人造卫星)in 1957 by R______ scientists.Dogs have become film stars,too.A dog called Lassie was the star in quite a few American f__
• 翻译句子,1.Dogs have been man*s best friends for thousands of years.2.With the help of the dogs,many people lost in the snow were able to get home.3.Dogs have also helped in the research work in many fields of science.4.They can hear and smell better than man,but they cannot see so well.
• with the help of dogs ,many people(l.)in snow found their wayhome
• 【急在线等】今有NaCO3,NaHCO3,NaCl组成的混合物100g,加热到质量不再减少为止.剩余残渣为84.5g,将残渣溶于水中,滴入足量的AgNO3溶液得到白色沉淀,加足量的稀硝酸后大部分沉淀消失,剩余沉淀为12.26g,试计算混合物中NaCO3和NaHCO3的质量格式多少?【【【【过程】】】】
• 今有碳酸钠,碳酸氢钠,氯化钠组成的混合物100克,加热到质量不再减少为止,剩下的残渣为84.5g将残渣溶于水,滴入足量的硝酸银溶液得到白色沉淀,加足量的稀硝酸后大部分沉淀消失,剩余沉淀为12.26g,试计算混合物中碳酸钠,碳酸氢钠和氯化钠的质量分数各是多少?