An insulating material with a very low perm rating means that it _____.
a. is a very poor vapor retardant
b. is an excellent vapor retardant
c. can’t be used as an insulation finish product
d. must be applied in multiple layers to be an effective vapor retardant
b. is an excellent vapor retardant
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A) fifteen levels including zero B) sixteen levels including zero C) infinite levels D) four levels
Instantaneous contacts change their positions immediately when the coil is energized and change back to their normal positions immediately when the coil is de-energized.
Answer the following statement true (T) or false (F)
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Answer the following statement true (T) or false (F)