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成品图纸>三层、双拼、造价30-40%25252525252525E4%25252525252525B8%2525252525252587、开间20m%252525252525252525252525252525E4%252525252525252525252525252525BB%252525252525252525252525252525A5%252525252525252525252525252525E4%252525252525252525252525252525B8%2525252525252525252525252525258A、进深20m%E4%BB%A5%E4%B8%8A