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Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.D2 urine routine (microscopic examination of urine protein, urine sugar and urine sediment) o　　地球正遭受着许多意想不到的自然灾害，面 对这些灾害降临，六年级学生罗晓宇和柳眉通过 电脑联系到快乐星球的老顽童爷爷。老顽童爷爷 派风氏三兄妹带来了快乐星球上最先进的科学监 测设备，在网络空间成立了一间实验室，让孩子 们意识到了人类对地球的破坏，和如何来改善这 些。15年后，罗晓宇成为地球上一名优秀的环保 科学家，全身心的投入到了对我们赖以生存的家 的保护和建设中。最后，地球人和快乐星球人建 立了良好的学习交流，大家快乐地到快乐星球上 参观去了。At the beginning, No one has linked these big wasps to the Vietnamese army. However, everyone knows that it is definitely not a good thing for this kind of thing to fly over. I also don't know who it is. I shouted a "fight" at the top of my voice. This loud cry is called a big one. I can actually hear it very clearly through the interference of the "buzzing" sound. Afterwards, I am still thinking, if there is no "buzzing" sound of these big wasps, how loud is this person's voice? I'm afraid the loudspeakers can't compare with them.