问题
单项选择题
研究表明，长空气间隙的操作冲击击穿通常发生在（）。
A.波前部分
B.截断部分
C.结束时刻
答案
参考答案：A
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研究表明，长空气间隙的操作冲击击穿通常发生在（）。
A.波前部分
B.截断部分
C.结束时刻
参考答案：A
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