While assessing a 2-month-old child’s airway, the nurse finds that the child isn’t breathing. After two unsuccessful attempts to establish an airway, the nurse should（）

A. attempt rescue breaths.

B. attempt to reposition the airway a third time.

C. administer five back blows.

D. attempt to ventilate with a handheld resuscitation bag.

肠结核出现腹部肿块最常见于（）

A.溃疡型肠结核并局限性腹膜炎

B.溃疡型肠结核并肠曲及周围组织粘连

C.增生型肠结核

D.溃疡型肠结核同时有女性生殖器结核

E.溃疡型肠结核同时有肠系膜淋巴结结核