MRI计算机系统外部硬件不包括()
A.存储器
B.A/D转换器
C.输入设备
D.输出设备
E.监视器
参考答案:B
---Dad, must we wait until the light becomes green?
---Yes, I’m afraid we ______. That’s the traffic rule.
A.can
B.may
C.have to
D.need
骶管