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

被认为是中 * * 解放运动的音乐史诗是[ ]

A．《义勇军进行曲》

B．《毕业歌》

C．《铁蹄下的歌女》

D．《黄河大合唱》