It is not until January ,2013     the Presidential election of the United States comes to an end      we’ll know who is the new president.

A．before; that

B．that; that

C．that ;when

D．when ; that

若该病人非手术治疗效果不佳，已有手术指征需行手术治疗。提高对腰椎间盘突出诊断的精确性，确定手术部位的特殊检查是

A．椎管造影
B．B超检查
C．MRI检查
D．CT检查
E．可视性椎间盘造影