测量侧梁下垂时，自（）下平面与侧梁的交点拉一直线。
A.两端梁
B.两枕梁
C.两大横梁
参考答案：B
器质性脊柱侧凸的原因有（）
A.先天性脊柱发育不全
B.营养不良
C.肌肉麻痹
D.慢性胸膜肥厚粘连
E.肩部及胸廓畸形
The Oral Approach believes that language learning in real life is for the acquisition of spoken language while language learning in the classroom is for the ______ of literacy.
