inquiry and enquiry 它们的用法有什么不同?

例如军事调查法庭,英文是court of inquiry,不宜称为court of enquiry,「协助警方调查」,英文是to help the police with their inquiries,这个inquiries也不宜改作enquiries。\x0d而一般机构的询问处,英文是enquiry office或enquiry counter,不宜称为inquiry office或inquiry counter。说要问问汇率高低,英文是I will make enquiries about the exchange rates,这个enquiries也不宜改作inquiries。