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問題

解法ステップ

1. Understand the question

   what industry was the steam industry first used in? coal steel river rewatch submit

2. Brief Explanations

   The steam engine was first used in the coal industry (for pumping water out of coal mines). Among the options, Coal is the correct choice as steam technology's initial application was in coal mining operations. Steel industry's use of steam came later, and "River" is not an industry.

3. Final answer

   Coal (the option with "Coal" text, assuming the first checkbox is for Coal)

答え

Question Analysis

OCR Text

what industry was the steam industry first used in? coal steel river rewatch submit

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