books الدوران في صيغته العامة
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# The axis of rotation
# rotation period
# rotation center
# rotation direction
# rotation density
# rotation exercise
# rotation systems
# differential rotation
# Self-imposed rotation and highlighting
# general form
# Rotation and impact angle
# job rotation
# Conic sections in their general forms
# Rotation related direction
# Rotation and axial tilt
# Optical rotation scattering
# differential rotation of the sun
# Rotation speed increase
# astronomical rotation
# Double Rotation Devices
