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8255a内部具有8个输入输出接口。（)

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若8259a中icw2的初始值为40h，则在中断响应周期数据总线上出现的与ir5对应的中断类型码为45h。（)

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主权是一个国家独立自主地处理内外事务的权力。（)

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Giventhefollowingscript，whydoestheoutputcomeoutasanemptylineinsteadof"dog"（）!/bin/ksh$VAR=dogecho"${VAR}"

A. The$VARvariablewasnotexported.
B. The$VARshouldhavebeensetasVAR.
C. dogneedsdoublequotesarounditwhensetting$VAR.
D. The{}shouldnotbearoundVARintheechocommand.

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Acustomer’sdatacenterhasallPOWER4+systems，andtheyplantoaddthreenewp5-570systems.Theywillbepurchasinganew7310-CR2HMCtosupportthePOWER5systems.WhatisakeyrequirementthattheyneedtoplanforwiththenewHMC？（）

Adesk，asitnotrackmountable
B. EthernetconnectionstothePOWER5systems
C. SerialconnectionstothePOWER5systems
D. USBconnectionsforthekeyboardandmouse

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