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A、B......J,其PERT如下图所示(A=1表示任务A的持续时间是1天),则项目X的关键路径是( 2)。
(1).
A.每个任务从何时开始
B.每个任务到何时结束
C.各任务之间的并行情况
D.各任务之间的依赖关系
(2).
A.A-D-H-J
B.B-E-H-J
C.B-F-J
D.C-G-I-J
下述任务中,不属于软件工程需求分析阶段的是 ( ) 。
A、分析软件系统的数据要求
B、确定软件系统的功能需求
C、确定软件系统的性能要求
D、确定软件系统的运行平台
MIDI enables people to use (1) computers and electronic musical instruments . There are actually three components to MIDI, the communications " (2) ", the Hardware interface and a distribution (3) called "Standard MIDI Files". In the context of the WWW, the most interesting component is the (4) Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol (5) are stored in MIDI files, the events are also time-stamped for playback in the proper sequ