为民旅社有床位840张，比扩建前增加了20%，扩建前比扩建后少多少张床位？

尺神经伤

A．良性骨肿瘤
B．恶性骨肿瘤
C．有恶性倾向的良性骨肿瘤
D．骨瘤样病变
E．继发性骨肿瘤

________ was announced on January 29, the examination was continued at the beginning of the new term.[ ]

A. What  

B. As

C. Which 

D. That

如果发生安全事故，导游人员可以及时向所属旅行社或当地旅游行政管理部门报告。

抽引器的作用是什么？