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TAKE THE QUIZ“f1”
We have one entry that includes the term f1.
F1 layer
noun: the lower of the two layers into which the F region of the ionosphere splits in the daytime that occurs at varying heights from about 80 to 120 miles (130 to 200 kilometers) above the earth's surface
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- The business’s new computer system proved not to be a panacea.
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Merriam-Webster unabridged
