Propersi普罗佩尔西properadj.合适的；正当的；真正的properties of pulp纸浆性能proper maintenance适当维护Properties of fuel燃料品质proper perspective正确的看法, 正确的观察角度proper convex body固有凸体proper maneuvering适当的机动灵活proper lubrication适当润滑,可靠润滑proper coefficient真系数proper application合理施药properdin factor D备解素D因子