Z16781: Difference between revisions

ລຸ້ນແກ້ໄຂເກົ່າເມື່ອ ໐໓:໒໗, ໒໖ ມິຖຸນາ ໒໐໒໔

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@@ ແຖວ ໙໕: / ແຖວ ໙໕: @@
                     "charges attract",
                     "attractive charges",
-                    "electrostatic attraction"
+                    "electrostatic attraction",
+                    "are opposite signs",
+                    "opposite signs"
                 ]
             }