The old engineer's eyes still shone bright in the wrinkled brown face and his step as he came across

the room was ________, though slow. [ ]

A. shaky  

B. heavy

C. casual  

D. steady

卷褶伪影可以通过下述方法抑制()

A．减小层厚　

B．加大FOV　

C．全矩阵采集　　

D．改变频率编码方向　

E．增加平均次数