问题 as引导的是非限定定语从句吗

Some support risky prospects and when a product is established, as is happening with low-carbon protein, they take their capital and move to the next nascent market.老师您好，请问这里的as引导的是非限定定语从句吗？应该怎么翻译呢？谢谢

问题 which可否改成as

When deeply absorbed in work, (WHICH) he often was, he would forget all about eating or sleeping.【疑问】which可否改成as？谢谢！

问题 as与when引导时间状语从句的一个难点（只能用when)

在书上看到这样一个说明：不要简单地认为 as 表示“当……的时候”。比如：误：As I started work here, the pay was just $12 a week.正：When I started work here, the pay was just $12 a week.请问这里的 as 错在哪里？

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