The insulation methods of several DC systems are compared and analysed. A ping-pang variable bridge measurement is adopted. The ex - act on line detection of grounding resistance is realized.
比较分析了几种直流系统常用的绝缘检测方法，采用乒乓式变电桥测量法，实现了接地电阻的准确在线测量。
Playing ping pang is one of my favorite pastimes.
打乒乓球是我最喜欢的娱乐项目。
What about playing Ping Pang or anything else?
咱们是打乒乓球还是怎么办？
I am glad you love playing ping pang.
很高兴你喜欢打乒乓球。
This thesis aims at modeling a special system, which can be described in this way : The control system is to controling the light-quality object in the sealed pipeline. (eg: ping pang balls).
论文是针对一个特殊的系统进行建模，此特殊可描叙为：控制系统为对密封管道中质量轻物体（以乒乓球为例）高度的控制。
He was among the first American businessmen who came to China right after the Ping Pang Diplomacy in the mid-70s.
他是七十年代中期乒乓外交后首批来中国的美国商人之一。
He was among the first American businessmen who came to China right after the Ping Pang Diplomacy in the mid-70s.
他是七十年代中期乒乓外交后首批来中国的美国商人之一。
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