在行车作业时，应正确执行什么制度？
参考答案：呼唤应答、确认检查制度。
I was surprised to know that ______ two top students were caught stealing in the supermarket.
Worse still, ________ third one was found fighting with others. [ ]
A. the; a
B. the; the
C. /; a
D. /; the
什么是拉式经营体制？
