地方性甲状腺肿病因() ["缺碘","缺硒","汞中毒","铁过剩","铜代谢异常"]
直肠癌侵犯尿道:() ["排尿不畅","肝大","直肠内剧烈持续性疼痛","恶病质","肛门部溃疡"]
色弱的患者读一个色盲图时所需的时间为() ["5秒钟内","2秒钟内","3秒钟内","4秒钟内","超过5秒钟"]
下列关于与环境相关的几个概念,表述正确的是()。 ["景观可以分为自然景观和人文景观","生态强调客体对主体的效应,而环境则阐述客体与主体之间的关系。","生态系统也就是生命系统与环境系统在特定空间的组合","一个城市、一个居住区既与其外界互相发生作用,同时其内部也是一个相对封闭的生态系统","人类的生态环境凝聚着自然因素和社会因素的相互作用,是自然生态环境与社会生态环境共同组成的统一体"]
气滞血瘀型锁肛痔方选:() ["六磨汤","少腹逐瘀汤","桃红四物汤","桂枝茯苓丸","丹参饮"]
为什么说运输能够使商品增值?