Can I take an X-ray in a general clinic in Hong Kong?

First of all, I'm not sure what you mean by general outpatient service. Hospitals in Hong Kong are divided into public hospitals and private hospitals. All public hospitals have X-rays, and they are free, but you need to make an appointment. Private hospitals are divided into general outpatient clinics, small ones, generally do not do X-rays, and some cooperate with public hospitals to arrange photos.