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One Electrical Technology Question per Day 2018.12.28

2018-12-28View Original

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This post was last edited by sdscj0122 on 2018-12-28 at 10:52. The operating time for time-limited overcurrent protection is set according to a stepped principle, with the time interval Δt generally taking the value of ( ) A. 0.4S B. 0.5S C. 0.7S D. 1.0S

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