与梯度磁场强度变化无关的因素有：()
A．层厚
B．扫描野
C．空间分辨率
D．扫描时间
E．磁共振信号强度
参考答案：D
Measer. Sharp & Co. have ______ us saying that they are unable to trace your name on their books.
A．replied
B．been in reply to
C．replied to
D．in reply to
敷软膜涂沫时应从（）处开始
A.额头
B.眼周
C.口周
D.颧骨
