正常情况下，羊水的pH约为（） ["小于4.5","4.5～5.5","5.5～6.5","6.5～7.0","7.0～7.5"]
正常孕妇尿液的pH约为（） ["小于4.5","4.5～5.5","5.5～6.5","6.5～7.0","7.0～7.5"]
妊娠晚期正常阴道分泌物的pH约为（） ["小于4.5","4.5～5.5","5.5～6.5","6.5～7.0","7.0～7.5"]
当外阴部受到损伤时，最易形成血肿的部位（） ["大阴唇","小阴唇","阴阜","阴蒂","前庭大腺"]
由宫颈达骨盆侧壁（） ["圆韧带","主韧带","子宫骶骨韧带","卵巢固有韧带","骨盆漏斗韧带"]
牙轮钻头正常损坏的部位主要集中在哪几处？
