Old elder brothers consulting a problem I see caught the DHCP and analysis in the teaching material option for example 55 or 60 will have an option value value on teaching material and then say the value is usually the only 55 value corresponding to the corresponding types such as option value is ios option value value is 60 android then try caught my own mobile phones and computers DHCP saw a circle, there's no value in the option value is where I didn't operate on or what???????