Current location - Quotes Website - Personality signature - Signature verification failed to recover the defeat.
Signature verification failed to recover the defeat.
The installed software is wrong. It is recommended that you uninstall, reinstall and try again. At the same time, if it is not the latest version, please update to the latest version of the app before logging in.

Signature verification failure is an online course learning software specially prepared for friends who want to engage in the chemical industry. A large number of course contents, such as chemical engineering foundation, management question bank, key chemical control, industry and trade industry, key supervision technology, etc., online learning and examination exercises.