This system extracts questions to set papers randomly and dynamically according to predefined rules, reminds examinee by counting down, submits test papers by force when time is out, saves examinees answers periodically for future recovery from failure,and marks objective questions automatically while leaves subjective ones to handwork.

The realization of CAN-bus monitor applied in Tobaco-machine;

Oil leak was a problem of transfer arm in spider mechanism in PROTOS cigarette making machine,the leaked oil would enter the negative pressure passage and pollute cigarette.