【Daily Question】2.2 Corrosion process of metals in still fresh water (3 rewards for replying + additional 3–8 rewards for answering correctly)

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Question: Fill in the blank: The corrosion process of metals in still fresh water is primarily controlled by the diffusion step of ( ). Oxygen – Requirements and hints for answering questions: Answer carefully. Hint: If you don’t understand something, use Baidu. Note: We will close this thread after 24 hours, and at that time we will announce the best response (the most helpful one), along with the answer and explanations. Other details: Recruitment for moderators & technicians in the [Mechanical Section] – applications and referrals are welcome. 【Valid indefinitely】【If you’re interested, come ahead!】 】(Click to enter) ★Haichuan’s “Gratitude Season” – a large-scale member sharing event★ (To enter the lucky prize draw, click “I want to register”). 【Mechanical Section】Comprehensive guide to preventing equipment freezing over during winter. 【Mechanical Section】Call for collection of essential knowledge. 【Seeking manufacturer sponsors】(Ongoing activity). Rewards are available for recommending valuable content; the selection process for “Most Active Users” and “Weekly Stars” in the Mechanical Section has begun. Wealth, metals, corrosion, sections, machinery