我国正常成年男性的血量约占体重() ["A．10％","B．9％","C．8％","D．7％","E．6％"] 肺癌发病率的男女之比为() ["A．1:1","B．2:1","C．2～3:1","D．3～5:1","E．4～6:1"] 门静脉由() ["A．肠系膜上静脉和脾静脉汇合而成","B．肠系膜下静脉和脾静脉汇合而成","C．脾静脉和胃左静脉汇合而成","D．脾静脉和胃右静脉汇合而成","E．肠系膜上静脉和胃左静脉汇合而成"] 中央型肺癌指的是() ["A．位于中央区的肺癌","B．靠近肺门区的肺癌","C．位于段支气管开口以上的肺癌","D．纵隔型肺癌","E．位于肺野内带的肺癌"] 手术切除有困难的Ⅲa-b期非小细胞肺癌，目前公认的最佳治疗方法为() ["A．化疗加放疗","B．单独化疗","C．单独放疗","D．术前放疗加手术","E．术前化疗加手术"] 在各型肺癌中预后最差的是()