6 hours of gadgets and tips for online learning of laboratory safety knowledge in Central South University

        The school requires 6 hours to complete the exam, but if you stop for 5 minutes on a page, you will be prompted whether to continue, no timing

Solution 1

Link: https://pan.baidu.com/s/1OtmimLCha3ORrvA-ED1TPg
Extraction code: ndwk

Solution 2

        360 Security Manager has an automatic refresh function, which can be set to refresh every 4 minutes.

Solution 3

        It is said (I haven't used it), the edge browser also has a similar function.