When you are making a high potential test on a piece of repaired electrical machinery, a rise in leakage current indicates （）.

A.one thousandth (10 to the -3rd power)
B.one millionth ( 10 to the -6th power)
C.one billionth ( 10 to the -9th power)
D.one trillionth (10 to the -12th power)

A.without switches on it
B.with insulated switches and no exposed terminals
C.without circuit breakers
D.without safety hand nails nor rubber mats

A.larger than the greatest branch resistance
B.smaller than the lowest branch resistance
C.equal to the sum of the individual branch resistances
D.one-half the sum of the individual branch resistances