frontal arc terrane

frontal(frontal)apron-plain

arc-arc collision

arcarc transform fault

left-lateral arc-arc transform fault

right-lateral arc-arc transform fault

trans-frontal sinus frontal approach

AC arc welding power source∥Pulsed arc stabilizer

Arc inverted-arc

Beaman stadia arc=Beaman arc

East China Sea and Ryukyu Trench Arc Back-Arc

gas metal arc welding-pulsed arc

high-velocity air-fuel arc(HVAF-ARC)

island arc-island arc collision

island-arc-inner arc basin zone

Plasma arc ∥ Plasma arc by a microcomputer aided photo processing

trench-arc-back arc system

twin arc submerged arc welding

Acute frontal sinusitis