简述电子签名与传统签名的功能比较。
You work as a database administrator for Certkiller .com. In the middle of a transaction， a user session was abnormally terminated but the instance is still up and the database is open. Which two statements are true in this scenario？（） Event Viewer gives more details on the failure.。 The alert log file gives detailed information about the failure.。 PMON rolls back the transaction and releases the locks.。 SMON rolls back the transaction and releases the locks.。 The transaction is rolled back by the next session that refers to any of the blocks updates by the failed transaction.。 Data modified by the transaction up to the last commit before the abnormal termination is retained in the database.。
甲为投身恐怖主义活动而参加了某国际恐怖主义组织，法院认定甲构成参加恐怖组织罪。甲的行为属于（） 预备犯。 实行犯。 帮助犯。 未遂犯。
简述命名空间的两种引用方式。
（）的作用方向恒定，与运动方向无关。 反抗转矩。 离心式转矩。 位能转矩。 恒功率转矩。
根据《反家庭暴力法》的规定，人身安全保护令的有效期不超过（）。
