在△ABC中，a、b、c为三边长，若a2+b2=9，b2+c2= 14，a2+c2= 13. 则∠C=
90°
The nurse is providing postoperative care for a client recovering from abdominal surgery. The client is receiving morphine through a client-controlled analgesia pump. Which finding would indicate that the client is obtaining adequate pain relief ？（）
A．Awakening several times during the night to redose.
B．Respiratory rate of 10 breaths/minute.
C．Pain rating of 2 or 3 on a scale of 0 to 10.
D．Complaint of itching as an adverse effect of the analgesia.
()一旦发生国际货运事故，须以积极的态度来认真处理，将损失降低到最低限度。
A．正确
B．错误
