[问答题,简答题] 胃肠道手术应作哪些手术前准备?

因消化道恶性肿瘤转移最早受累的是() ["A．肺","B．肾","C．肝","D．脾","E．胰"] 呼吸功能障碍的病人，手术前准备应注意什么? 肝癌切除手术中一般至少要保留正常肝组织的() ["A．15%","B．20%","C．25%","D．30%","E．35%"] 手术前准备主要应做哪两方面的工作? 肝脏肿瘤中最常见的是() ["A．肝细胞性肝癌","B．胆管细胞癌","C．混合型肝细胞管细胞癌","D．血管肉瘤","E．腺癌"] 胃肠道手术应作哪些手术前准备?