There are multiple parallel technical features used or connected in the patent. The alleged infringing product only uses one of them and can only use one technical feature. Is it an infringement?

For better explanation, let’s transform your question first.

The patent claim is: Feature A (Feature B or Feature C), where Feature A can be “0 ”,

A accused product covers feature A, and can only cover one of feature B or feature C, but cannot cover both feature B and feature C at the same time. Doesn’t it count as infringement?

If the above deformation is understood correctly, the answer is as follows, for reference only:

In fact, the claim can be regarded as a complete technical solution 1 (feature A and feature B) or a complete technical solution 2 (Feature A, Feature C),

Comprehensive coverage means having every technical feature of complete technical solution 1, that is, (feature A, feature B), or having every technical feature of complete technical solution 2, that is, (feature A feature C).