单项选择题
（ ）is not the advantage of GERT （Graphical evaluation and review techniques）as compared with PERT （project evaluation and review techniques）.
A. Allowing looping B. Allowing for dummy tasks C. Allowing branching D. Allowing multiple project end results
单项选择题 The length of the IPv6 address is （ ）.
单项选择题 A （ ）is a software that provides a method of communication between two electronic devices over the World Wide Web.
单项选择题 以下关于变更的流程和规则的做法中，（）是错误的
