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【单选题】
根据计时观测资料得知：每m2标准砖墙勾缝时间为10min，辅助工作时间占工序作业时间的比例为5%，准备与结束时间、不可避免中断时间、休息时间占工作班时间的比例分别为3%、2%、15%。则每立方米砌体l标准砖厚砖墙勾缝的产量定额为( )m3/工日。A.
8.621
B.
8.772
C.
9.174
D.
14.493
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