作战行动中指挥员要定期组织指挥机关督促检查各参战单位执行命令、指示情况。（）
参考答案：错
* * 清洁度检查指标中不包括（）。
A.杆菌
B.球菌
C.上皮细胞
D.红细胞
E.白细胞
The road is under construction and that is _____ he hasn't arrived. [ ]
A. the reason at which
B. why
C. the reason which
D. what
