choices.label: A B C D
choices.text: sea ​​water:ship river water:generator coal:combustion oilfield:drilling
explanation: the source of power that drives the "windmill" is "air". the "ship" sails on "sea water", which is not the source of power for the "ship". the source of power that drives the "generator" is "river water". "combustion" is the function of "coal", which is not the power source of "combustion". one of the engineering stages of exploiting an "oil field" is "drilling," which is not the source of power for an "oil field.".
relation: air windmill R3.10
relation: sea ​​water ship R3.6
relation: river water generator R3.10
relation: coal combustion R3.3