More than five      doctors and rescuers have got to Yushu County up to now．

A．thousand

B．thousands

C．thousand of

D．thousands of

Moving-BarTechnique是指（）

A.独立准直器技术

B.非独立准直器技术

C.孔雀系统准直器技术

D.棋盘式准直器技术

E.条形挡块移动技术