Which of the following are true about WebSphere Commerce Payments cassettes？（） The site does not need a cassette， unless the site requires real-time credit card validation.。 A cassette is a piece of plug-in software that provides support for a specific payment system.。 The CyberCash cassette is installed by default， with the installation of WebSphere Commerce Payments.。 Third party companies can create custom cassettes that will work with WebSphere Commerce Payments.。 Cassettes convert the merchant payment request to the payment protocol of the local payment system.。
刘某购买了一种寿险产品，保费用途透明，分解为保障、投资和费用三部分；缴费灵活，只要保单现金价值足以支付保障费用，保单就不会失效；对现金价值处置灵活，如保单质押贷款、部分退保等；保险金额可以根据刘某的保障需求变更。由此可知，刘某购买的是（）。 分红保险。 定期寿险。 万能寿险。 终身寿险。
On Tuesday， a junior DBA dropped an important application user account， whose schema has important tables. You are asked to recover all the objects in the schema. On investigation， you find that the user account was dropped at 11：00 a.m. and Sunday’s backup is the most recent backup. Which flashback feature would you use？（） Flashback Drop。 Flashback Table。 Flashback Database。 Flashback Version Query。 Flashback Transaction Query。
请简略描述安全链与变桨系统之间的关系。
创业风险
Which three types of files can be automatically placed in the flash recovery area fast recovery area in 11g Release 2？（）
