纯剪切应力状态下，各向同性材料单元体的体积改变为（）。A．变大 B．变小 C．木确定

There was a big fire in the street last night, but the firemen _______ within twenty minutes.

A．took it out

B．brought it out

C．worked it out

D．put it out

The two brothers carried a ______ bed into the room.

A．double

B．deal

C．slight

D．opposite

—Excuse me, I wonder if you can help. I _______ my ID card.  

—But where did you lose it?  

阴证的疼痛表现是（）

A.疼痛剧烈、拒按

B.疼痛游走不定

C.痛势甚速

D.隐痛或不痛

E.时有时无

“临床”一词源于医学术语“临床治疗”，其基本含义是一对一、面对面的医患关系，强调亲临病床、直接观察、切实诊断、对症下药。