A close examination of most DTDs, however, reveals a fair degree of flexibility-particularly if the DTD is from a generic source or derived from a standard or specification.
Examine can avoid artificial factor on the net, make examination more fair, reasonable, objective and true, and truly attain a purpose of raising the quality of workers.
网上考试可避免人为因素，使考试更加公平、合理、客观、真实，能真正达到提高职工素质的目的。
3
The reason is that the principle of fair competition in the imperial examination system has disappeared completely while it is reserved and developed in the British civil-service system.