Was it what he said _____ made her so sad ?
A. which B. why C.what D that
答案：D
股骨外科颈骨折时蘑菇头样大头垫放置方法是
A．外展型骨折时大头垫应顶在腋窝部
B．外展型骨折时大头垫应放在肱骨内上髁的上部
C．内收型骨折时大头垫应顶在腋窝部
D．内收型骨折时大头垫应放在肱骨内上髁的上部
E．内收型骨折时大头垫应放在肩部
教学原则与教学规律有什么联系和区别？
