Lead I is perpendicular to lead _____
a. II
b. III
c. aVF
d. aVL
C
In the hexaxial reference system, the axes of some leads are perpendicular to each other. Lead I is perpendicular to lead aVF. Lead II is perpendicular to aVL, and lead III is perpendicular to lead aVR.
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Fill in the blank(s) with correct word
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