首选有价值的检查是
A．脑脊液常规
B．视觉诱发电位
C．脑部MRI
D．胸部X线片
E．血清IgG
参考答案：B
A luxury express train jumped the tracks on a bridge in eastern India, killing at least 50 on the spot. According to the Northern Railway spokesman, the death ______ is expected to rise.
A．figure
B．toll
C．span
D．yield
天平的主要技术数据包括最大称量，分度值和秤盘直径及秤盘上方的空间。（）
