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There are five kinds of creation modes (1-5): factory method mode, abstract factory mode, singleton mode, builder mode and prototype mode.Gee, what a delicious subject this is!一时间，大河两岸战争一触即发。CAT5: Category 5 Unshielded Twisted Pair? Twisted? Pair)? Unshielded twisted-pair cables are composed of multiple pairs of twisted-pair cables and a plastic sheath.她无法对一个小孩子用心机，况且往常泥鳅常来张家跟板栗玩的，因此不由自主地就用关切的口吻责备起来。于是匆匆进宫来找自己的姐姐吕雉，间接向汉王刘邦求情。When "cracking" the sand pile paradox, we often have to set a fixed boundary. If we say "10,000 grains of sand are a pile of sand", then less than 10,000 grains of sand cannot be called a pile of sand. Then it is somewhat unreasonable to distinguish 9999 grains of sand from 10001 grains of sand. This has to set a variable boundary, but what is this boundary? We don't know now. Then the value of "10,000 grains of sand are a pile of sand" originally set as knowledge will be reduced.