In general, you should never use a breaker larger than 20 Amps on a #12 AWG (American Wire Gauge) copper wire.
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You can use a 20-amp single pole breaker for 12-2 wire. This is the standard size breaker for 12-gauge wire in residential applications.
"122 degrees east longitude" is the description of a line between the north pole and the south pole, about 12,400 miles long, passing through Russia, China, the Philippines, Indonesia, Australia, and Antarctica. There are literally thousands of population centers of all shapes and sizes on or near that line.
122 grams is 4.3 ounces.
122 grams is 122,000 milligrams.
There are 12.2 centimeters in 122 millimeters.
7lbs 10oz in 122 ounces.