单项选择题
When you are making a high potential test on a piece of repaired electrical machinery, a rise in leakage current indicates （）.
A.good insulation B.bad insulation C.high insulation power factor D.a high slot discharge factor
单项选择题 The sub-multiple prefix "milli" (m) means （）.
单项选择题 A “dead front” switchboard is one （）.
单项选择题 The total resistance of a parallel circuit is always （）.
