This paper mentions the problems on applying china insulator by the direct current transmission.

本文叙述了直流输电线路使用瓷绝缘子存在的问题。

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The operations of current transmission switch used to realize threshold-controlling circuits are established.

建立了实现阈值控制电路的电流传输开关运算。

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The operations of current transmission switch used to realize threshold-controlling circuits were established.

建立了实现阈值控制电路的电流传输开关运算。

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Exciting new research data has been published this year showing how effective HIV treatment can be at stopping HIV transmission and current drugs are helping HIV positive individuals lead long and healthy lives.

WHITEHOUSE: Using National Latino AIDS Awareness Day (NLAAD) to Redouble Our Efforts to Respond to the HIV Prevention and Care Needs of Latinos | The White House

Large-scale electricity transmission usually uses alternating current, in which both current and voltage oscillate.

ECONOMIST: Superconductors are starting to become useful

At 400 kilovolts, a standard value for long-distance transmission, an alternating current 30 metres (100 feet) from the ground has a fortieth of the loss of a similar cable at ground level.

ECONOMIST: Power transmission