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成品图纸>四层、双拼、造价20-30%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525E4%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525B8%25252525252525252525252525252525252525252525252525252525252525252525252525252525252525252587、开间20m%E4%BB%A5%E4%B8%8A、进深12-14m