影响密度分辨率的主要因素是()
A．重建算法
B．信噪比
C．探测器孔径
D．X线管电压
E．模数转换效率
参考答案：B
The schoolboys and schoolgirls are walking along the street, a small redcap .
A．each of them has
B．they each have
C．every wears
D．each wearing
下列不属衍生金融产品的是( )。
A．期货B．互换C．远期D．国库券
