值班人员因工作需要移开遮栏进行工作，要求的安全距离是10KV时（）米，110KV时（）米。
参考答案：0.7；1.5
Usually John would be late for meetings. But this time, _____ to my surprise, he arrived on time. [ ]
A. little
B. much
C. ever
D. even
圆锥破碎机中修周期为（）个月。
A．3
B．6
C．9
