● The user must interact with the (74) in order to accomplish task.
(74)
A. printer
B. memory
C. CPU
D. operating system
● Maintenance activities include（74）.①making enhancements to software products②developing a new software product③correcting problems④adapting products to new environments（74）A．①②B．①③④C．②③④D．①②③④
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试题（74）Changes often happen in（74）．（74）A．Initiating ProcessB．Executing ProcessC．Planning ProcessD．Closing Process
下列哪些是加法器？（）A．74LS183B．74LS138C．74LS283D．74LS148
9、下列哪些是加法器？（）A．74LS183B．74LS138C．74LS283D．74LS148
1、面心立方、体心立方和密排六方的配位数分别为A．74％、68％、74％B．68％、68%、68%C．68％、74%、68%D．74％、74%、74%
14、面心立方、体心立方和密排六方的致密度分别为A．74％、68％、74％B．68％、68%、68%C．68％、74%、68%D．74％、74%、74%
下列不是与非门的集成芯片是 （)。A．74LS04B．74LS32C．74LS00D．74LS10E．74LS20F．74LS30
