问题：
[多选题]What are the disadvantages of air as an insulator? ()
ASurface need remain clean and free of dust over long periods
Blow cost
Cunrepairable
Dpoor dielectric strength
[多选题]What are the disadvantages of air as an insulator? ()
ASurface need remain clean and free of dust over long periods
Blow cost
Cunrepairable
Dpoor dielectric strength
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