The nurse is caring for a client admitted to the hospital with a bowel obstruction. The nurse should wear sterile gloves when

A. inserting an indwelling urinary catheter.
B. giving a back rub on intact skin.
C. changing an oxygen system.
D. inserting an IV catheter.

司马迁身受腐刑，但仍然完成了《史记》的撰写而流芳百世，这种心理防御机制叫做（）。

A.升华

B.反向

C.幽默

D.否定

E.投射