congruent
7.Solation of Congruent Equation a_1x_1+a_2x_2+…+a_nx_n≡b(modm)
9.Study of the ultraviolet absorption edge of LiNbO_3 crystal solid-liquid congruent point composition
10.a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms.


