位编码是通过施加梯度场,使不同位置磁矢量的不同而进行编码定位 ()
A.频率
B.相位
C.加权
D.大小
E.层厚
参考答案:B
—I’ve been working really hard at English recently, but it still remains weak.
—Don’t give up. Sometimes things don’t ______ like you want right away. [ ]
A. turn out
B. turn up
C. turn down
D. turn away
义务兵退出现役,可以免试进入中等职业学校学习。