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[A]: For accurate measurement of Doppler echocardiography the frequency of ultra- sound waves should be noticed. [R]: Ultrasound beam can be as close to par- allel.A. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true and R is falseD. If both A and R are false

Answer» Correct Answer - B


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