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#1 Practice Exam Question ID: B-007-002-005
What two sub-regions of ionosphere exist only in the daytime?
A) Electrostatic and electromagnetic
B) F1 and F2
C) D and E
D) Troposphere and stratosphere
Please write down your unanswered question numbers to go back to them later with the "Go to Question #" box. Unanswered questions will be marked as incorrect once the "Finish Exam" button is pressed.
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Date modified:
2018-11-06
