The writer concludes that school rules to forbid smoking ______.
A.should be introduced, for it really works at the school where he once studied
B.should not be introduced, for it may cause disturbance
C.should be introduced though it may not work effectively
D.needn't be introduced as long as teachers don't smoke in front of children
第1题
在DMA有效操作周期中,是在()工作状态对外设的DMA请求作出响应的。
A.SO
B.S1
C.S2
D.S3
第4题
A.DREQ、DACK、HRQ、HLDA
B.DREQ、HLDA、DACK、HRQ
C.HRQ、 DREQ、DACK、HLDA
D.DREQ、HRQ Q、HLDA、DACK
第5题
A.DREQ、DACK、HRQ、HLDA
B.DREQ、HLDA、DACK、HRQ
C.HRQ、 DREQ、DACK、HLDA
D.DREQ、HRQ Q、HLDA、DACK
第6题
A.DREQ、DACK、HRQ、HLDA
B.DREQ、HLDA.DACK、HRQ
C.HRQ、DREQ、DACK、HLDA
D.DREQ、HRQ、HLDA.DACK
第8题
在DMA有效操作周期中,可以根据需要插入一个或多个SW周期,SW周期的插入位置是在()。
A.S0与S1之间
B.S1与S2之间
C.S2与S3之间
D.S3与S4之间
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