单项选择题

在机房布置中，为便于操作，机柜和设备前面预留的空间不小于______。

A．1000mm
B．1500mm
C．1800mm
D．2000mm
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单项选择题
Maintenance activities include (74) 。 ①making enhancements to software products ②developing a new software product ③correcting problems ④adapting products to new environments
A．①②
B．①③④
C．②③④
D．①②③④
单项选择题
Which of the following would require real-time processing______.
A．Playing a computer game
B．Executing a program that predicts the state of economy
C．Printing labels
D．Listening the music
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