题目内容

通过计时观察资料得知：人工挖三类土1m3的基本工作时间为7小时，辅助工作时间占工序作业时间的2%。准备与结束工作时间、不可避免的中断时间、休息时间分别占工作日的3%、2%、18%。则该人工挖三类土的时间定额是（）工日/ m3。

A. 1.16
B. 1.14
C. 0.94
D. 0.875

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