【单选题】【消耗次数：1】
项目的“一次性”是指（ ）。
①
项目没有确定的开始和结束时间
②
项目有确定的开始和结束时间
③
项目在不确定的时间结束
④
项目可以在任何时候取消
参考答案：
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相关题目
【单选题】
测定某一定额项目的基本工作时问为6min，辅助工作时间是基本工作时间的12％，准备与结束时间、休息时间和不可避免的中断时间各占作业时间的15％、10％和5％，则该项目的定额时间是( )min。
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8.736
②
8.52
③
8.425
④
8.353
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