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【多选题】
关于网络图中的虚工作，表述正确的是( )。
A.
虚工作既不消耗时间，也不消耗资源
B.
双代号网络图中，虚工作主要用来表示相邻两项工作之间的逻辑关系
C.
双代号网络图中，为了避免两项工作编号重复，用虚工作加以区分
D.
虚工作只消耗时间，不消耗资源
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