如下图中T和U是两个事务，X是数据对象。关于该图，说法正确的是__________。http://nos.netease.com/edu-image/E62993ED6BD946AD7CB37DA9E953ABDA.png?imageView&thumbnail=520x520&quality=100
举一反三
- 有效性确认是一种并发控制方法。如下图(a)(b)中T和U是两个事务，X和Y是数据对象。T要进行有效性确认，下列说法正确的是__________。http://nos.netease.com/edu-image/6A17559A8F0161C22D5EDE2A4B92CA21.png?imageView&thumbnail=520x520&quality=100
- 下图所示信号，利用傅里叶变换的性质，http://nos.netease.com/edu-image/F9AC0EAE656A58C6B840B77F44F798F9.png?imageView&thumbnail=520x520&quality=100和http://nos.netease.com/edu-image/1B59D65990752182463FA8D27B1D6589.png?imageView&thumbnail=520x520&quality=100分别为( )。
- 下图描述的密码属于http://nos.netease.com/edu-image/237ACC775E85A99FC393A102E8CEA8A2-1442217414283?imageView&thumbnail=520x520&quality=100
- http://nos.netease.com/edu-image/D00226428A68B461C3DBE595BE8B126C-1445045240312?imageView&thumbnail=520x520&quality=100
- http://nos.netease.com/edu-image/DCA9CF6A30595C532E3CCCDE0F107952-1442111327587?imageView&thumbnail=520x520&quality=100