国内外的研究发现，钩体_______的差别与致病力有关。
女，23岁，停经45天，阴道无异常分泌物，子宫附件声像图如下，图中所示为() ["A．正常早孕孕囊及胚外体腔","B．双胎妊娠双孕囊","C．难免流产","D．子宫肌瘤","E．早孕并宫腔积液"]
钩体传染源为_______、_______。
中年女性，中下腹横切面如图，箭头所示为() ["A．子宫钙化环","B．宫内节育器","C．子宫肌瘤","D．孕囊","E．子宫肌瘤钙化"]
手三阳经与足三阳经交接于 ["头","胸","腹","手","足"]
钩体革兰染色为_______，镀银染色被染成_______。
