若8259a的irr(中断请求寄存器)的内容为10h,说明ir64请求中断。()
查看答案
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。()
Giventhefollowingscript,whydoestheoutputcomeoutasanemptylineinsteadof"dog"()!/bin/ksh$VAR=dogecho"${VAR}"
A. The$VARvariablewasnotexported.
B. The$VARshouldhavebeensetasVAR.
C. dogneedsdoublequotesarounditwhensetting$VAR.
D. The{}shouldnotbearoundVARintheechocommand.