大型养路机械车在封锁区间独自运行时，续行间隔不得少于（）米。
参考答案：300
(2013·宝鸡二检)In my brother's absence, I would like to thank all concerned on his ________.
A．behalf
B．part
C．business
D．interest
简要说明追缉堵截在狱内侦查中的重要意义。
