下列哪些属于冻疮的临床特点？（） ["好发于冬季","好发于肢端及暴露部位","典型损害为虹膜样红斑","常发生在儿童及青年妇女或周围血循环不良者","临床表现为紫红色肿块，皮温低"]
有关铁代谢的正常值，错误的是（） ["体内总铁量3～4.5g","贮存铁1～1.5g","食物铁10～15mg/d","妊娠时需4mg/d","排出量约1mg/d"]
能凉血化瘀止血，治血热夹瘀的出血证宜首选（） ["茜草","大蓟","蒲黄","白及","艾叶"]
下列哪项与类风湿关节炎病情活动有关（）. ["晨僵","关节畸形","关节功能障碍","颈部受累","X线片有骨质破坏"]
大蓟的功效既能凉血止血，又能（） ["解毒排脓","解毒消痈","化痰止咳","清热利尿","安胎解毒"]
列出中国人腕骨骨化中心出现时间标准。
