贲门癌是消化通常见恶性肿瘤，本文收集中晚期病变病人７６例，从其病程，年龄，Ｘ线征象与手术切除的关系进行了分析，对评估肿瘤能否切除有一定参......

Rearing is an exploratory behavior induced by novelty, such as exposure to an open field. Stimulation of certain brain r......