Through controlling the vibration amplitude and directcurrentcomponent of the driving wave for the varifocal mirror, we can obtain the different depth range.
通过控制变焦镜驱动波的振幅和直流成份，可获得不同的深度范围。
2
The directcurrent system is an important component of the transformer substation, but its grounding is a common defect.
直流系统是变电站一个重要的组成部分，直流系统接地是常见的缺陷。
3
Thus, a direct bus current can be detected precisely and an upper harmonics component is inhabited.