In the accounting of intangible assets, which account is the depreciation expense of equipment credited to?

Depreciation expenses are included in the subject of "R&D expenditure".

The content of intangible assets accounting is the cost of intangible assets held by enterprises, including patent right, non-patented technology, trademark right, copyright, land use right and so on. Intangible assets refer to identifiable non-monetary assets that have no physical form and are owned or controlled by enterprises.