Physics
In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?

To allow the heat to get into the food through the hole
To allow the aroma of the food to come out through the holes
To allow the microwaves to get into the food through the holes
To prevent the steam pressure from bursting open the pouch

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Physics
Circuit breaker usually operate under

Steady state of short-circuit current
Transient state of short-circuit current
Sub-transient state of short-circuit current
After D. C. component has ceased

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