The voltage effective value was figured out by mean square.
再通过其均方计算出电压有效值。
When was the no-voltage protection test carried out? It there any test report.
失压保护试验是什么时候进行的，有试验报告吗？
If the input voltage is plus three, it comes out as minus six.
如果输入的电压是正三伏，那么输出的电压便是负六伏。
If the input voltage is plus three, it comes out as minus six.
如果输入的电压是正三伏，那么输出的电压便是负六伏。
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