题型:选择题 Bobby: Where's the food I ordered? I've waited for thirty minutes!Waiter: I'm really sorry, but the kitchen is very busy. You'll have it _______.[ ]A. already B. earlyC. onceD. soon 查看答案
题型:单项选择题 下面是关于两片8237级联构成主从式DMA控制器的叙述,其中正确的是 ( )。A.从片的HRQ端和主片的HRQ端相连,从片的HLDA端和主片的HLDA端相连B.从片的DACK端和主片的DACK端相连,从片的DREQ端和主片的DREQ端相连C.从片的HRQ端和主片的DACK端相连,从片的HLDA端和主片的DREQ端相连D.从片的HRQ端和主片的DREQ端相连,从片的HLDA端和主片的DACK端相连 查看答案