强直性脊柱炎骶髂关节X线改变中期表现特点（） A.关节间隙狭窄 B.关节间隙加宽 C

Questions 23-30
· You will hear people from the National Food Council complaining to retailers about the high prices they are charging for food products and household goods. They complain that the shops have marked up wholesale prices far too much.
· For each question (23-30), mark one letter (A, B or C) for the correct answer.
· After you have listened once, replay the recording.

The National Food Council has studied A. the reason for selling certain food. B. the supply and demand of certain kinds of food. C. the effect of price increases.

使用面弓的目的是（）

A.确定前伸髁导斜度

B.将上下颌骨之间的位置关系转移到架上

C.将上颌骨与颞下颌关节的位置关系转到架上

D.转移关系到架上

E.保持上下颌骨之间的位置关系

合并利润表

热力除氧器的原理是什么？

简述山石器设的布置要求。