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【单选题】
The types of short-circuit in three-phase system are three-phase short-circuit, two-phase short-circuit, two-phase short-circuit grounding and single-phase short-circuit grounding. When the three phases of the system are short-circuited, they are still in the symmetrical stated. Other types of shorted circuit are asymmetric short circuit. Which of the following types is a symmetrical short circuit?A.
Single phsae ground short circuit
B.
Three phase short circuit
C.
Two phase short circuit
D.
Two phase ground short circuit
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