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麻烦各位大神帮我解答一下第五道题,个人觉得需要20根地址线,但答案却是22根地址线
http://wenku.baidu.com/link?url=zacfqqWNFH4MTfgF7YRp3aIy9iqfdHk-3vvqt0_abOaefv7fCTeI3XV-GE2m-EC-ilQzfSg5xHXvd1t7Jw4IwBHp5MODe4dBaD3kFKoICFu