Arcis阿尔西arcn.弧；弧形物vi.形成电弧；按弧形轨迹行进arc drive characteristic电弧激励起动特性arctangent trigonometric反三角正切arcus palatinus anterior前(腭)弓, 舌腭弓Arc-Shaped Roller Bank弧形辊道Arcoscalpellum sociabilen.和气小铠茗荷arc-rupturing capacity熄弧能力; 灭弧能力arc-hyperbolic tangent反双曲正切arc subtended by a chord对弦弧arcus posterior atlantis寰椎后弓arc-sin transformation弦-弧换转法