These computers record which hours are busiest? 感觉which hours做了主语，难道不是which单独做成分的吗？
Reports can help to decide which products to emhpasize now. 没看出来which做什么成分。
which在这里是形容词，当定语。which hours 哪几个小时。
which products也是当定语，哪些产品。
which products也是当定语，哪些产品。
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