In a radio system, a selected processing frequency between RF (Radio Frequency) and the end product (e.g. Audio frequency).
Во средишната линија или средината.
Rate of vibration of a string or column of air, which determines pitch.
The property or condition of occurring at frequent intervals.
Electrically conductive fourth state of matter (other than solid, liquid, or gas), consisting of ions and electrons.
Fourth planet from the sun, a terrestrial planet.
Great circles that pass through both the north and south poles, also called meridians.
Time adjusted for location around the Earth or other planets in time zones.
A measure of distance, the distance light travels in one year, about 63,197 AU.
299,792 km per second, the constant c.
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Messengers of God who appeared to the Shepherds announcing the birth of Jesus.
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马其顿
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