—Would you mind             my little sister while I am away?

—Of course not.           [ ]

A. looking for                

B. looking at

C. looking after              

D. looking forward to

雷达显示器距离扫描起始时间由（）控制。

A、发射脉冲

B、触发脉冲

C、辉亮脉冲

D、距离标志脉冲