实际应用中，大部分DMAC采用的最常用、最简单的传送方式是( )
A．中断传送
B．周期挪用
C．周期扩展
D．CPU停机
参考答案：D
I didn't pass the math exam, because I had no _______ to finish it. [ ]
A. enough time
B. time enough
C. many time
D. many times
杵状指常见于（）
A.慢性肺脓肿
B.支气管扩张症
C.肝硬化
D.发绀型先天性心脏病
E.支气管肺癌
