为直接顶厚度与煤层采高的比值，（）时老顶的悬露与垮落对工作面支架有严重的影响。
A.N=4
B.4C.N>5
D.N<2
参考答案：D
After __ the luggage at the railway station,we left for the exhibition hall in a taxi. [ ]
A. claiming
B. demanding
C. deserving
D. obtaining
营业网点审批单位账户支取现金的审批权限是（）万元。
A.10
B.20
C.50
D.100
