()是减轻摩擦磨损的有效手段。
A、紧固
B、清洁
C、润滑
D、防腐
参考答案:C
Which of the following pieces of equipment would do best job to help prevent external rotation of the client’s right leg postoperatively
A. Sandbags.B. A high footboard.C. A rubber air ring.D. A metal bed cradl
照片上各组织间的密度差异称为
A.组织对比度 B.胶片对比度C.照片对比度 D.物体对比度E.X线对比度