The applicant may refer to the EO residual limit index for a single piece / set of devices in relevant standards. If reference is made to the allowable limit in GB / T 16886.7-2015, the applicant shall consider the combined use of multiple devices during the actual use of the product, and formulate the ethylene oxide residue limit for a single product / set in combination with the actual control level of EO residue of the product, and provide relevant basis.