【单选题】【消耗次数：1】
关于双代号网络计划中的虚箭线，下列说法中不正确的是(???)。????
①
虚箭线用来表达相关工作的逻辑关系
②
虚箭线所代表的工作不消耗时间
③
虚箭线所代表的可能是实工作，也可能是虚工作
④
虚箭线所代表的工作不需要消耗资源
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【单选题】
关于虚工作的说法，正确的是
①
虚工作只在双代号网络计划中存在
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虚工作一般不消耗资源但占用时间
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虚工作可以正确表达工作间逻辑关系
④
双代号时标网络计划中虚工作用波形表示
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