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【简答题】
设CPU共有16根地址线和8根数据线,并用MREQ作访存控制信号,RD、WR作为读写控制信号,现用1K×8位的SRAM,2K×8位的ROM,以及3-8译码器和门电路构成主存储器如图。 3-8译码器的译码输出Y0对应的地址范围是4000H—______H(填写4位十六进制数),Y7对应的地址范围是______H—______H。 假设存放系统程序的ROM区的地址范围是 6000H—67FFH,存放用户程序的RAM区的地址范围是6800H—6BFFH,图中译码器输出Ym的下标m=___,Yn的下标n=___。 假设ROM和RAM芯片的片选信号均为低电平有效,图中虚线框T代表的逻辑门是___门。
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【单选题】What does"this endeavor"in Line 116, Paragraph 24 refer to?
A.
Assuring a more fruitful life for all mankind.
B.
Serving the country by doing whatever it asks.
C.
Defending freedom when there is danger of losing it.
D.
Forging a global alliance against the common enemies.
【单选题】\"This line\" in Paragraph 3 refers to A．the line from the Tower Gateway
A.
/"This line/" in Paragraph 3 refers to A．the line from the Tower Gateway Station to Poplar.
B.
the line from Poplar to Island Gardens.
C.
the Millwall Extension Railway.
D.
the line from Poplar to Stratford.
【简答题】简述安全气襄系统故障诊断基本流程。
【简答题】A．Rescuers had saved 32 whales this time. B．50 whales died after becoming stranded last week. C．70 whale stranding incidents have happened since 1900. D．None of these incidents' involves more than 200...
【单选题】下列哪种情况不宜行嵌体修复
A.
青少年恒牙
B.
牙合面严重磨损需要咬合重建
C.
邻牙合洞上要放置牙合支托
D.
邻面接触点破坏的牙体缺损
E.
以上都不宜行嵌体修复
【简答题】What is meant by"this tendency"in Paragraph 4? How does the author think of its cauises?
【简答题】A. direct contact with infected blood B. from 2 to 15 or more years after becoming infected C. without symptoms D. acquired immuno-deficiency syndrome E. live in the same room with an HIV-infected roo...
【简答题】After becoming a member of the WTO, China will open more service areas step by step.
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