The need for insulation cleaning may be determined by （）<br>A:visual inspection for dirt accumulation<br>B:high megger readings<br>C:low operating temperature<br>D:the time period since the last cleaning

The need for insulation cleaning may be determined by （）
A:visual inspection for dirt accumulation
B:high megger readings
C:low operating temperature
D:the time period since the last cleaning

出自：海船船员证

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