question: steam engine:internal combustion engine
choices.label: A B C D
choices.text: jet:fighter traditional chinese medicine:western medicine flat-screen tv:lcd tv pulse telephone:digital telephone
explanation: the "steam engine", "internal combustion engine" and steam turbine are all power machines, and the "internal combustion engine" is more advanced than the "steam engine". "jet" can be "fighter", "fighter" can also be "jet", neither is more advanced both "traditional chinese medicine" and "western medicine" belong to medicine, but "western medicine" and "traditional chinese medicine" have no order of advanced level. "flat-screen tv" can be "lcd tv", "lcd tv" can also be "flat-screen tv", neither is more advanced both the "pulse phone" and the "digital phone" are telephones, and the "digital phone" is more advanced than the "pulse phone".
relation: steam engine internal combustion engine R2.6
relation: jet fighter R2.7
relation: traditional chinese medicine western medicine R2.6
relation: flat-screen tv lcd tv R2.7
relation: pulse telephone digital telephone R2.6