国内便携式超声诊断仪的供电是
A.220V50Hz
B.110V50Hz
C.220V60Hz
D.110V60Hz
E.380V50Hz
参考答案:A
He was obviously annoyed,for he was not used to ________ like that.
A.speaking
B.spoken to
C.being spoken
D.being spoken to
如何采用先进的计算机体系结构和生产技术,制造出具有()的计算机系统,是所有通用计算机设计的共同目标。