如果希望在关闭浏览器前删除cookie文件，使用下列（ ）函数实现。 A: setcookie('data','PHP',time()+1); B: setcookie('data','',time()+1); C: setcookie('data','PHP',time()-1); D: setcookie('data','',time()-1);

在Excel 2010单元格中，输入“DATE”&“TIME”的结果是( )。 A: DATETIME B: DATA-TIME C: 初始日期与初始时间 D: 系统日期与系统时间

_____it was the wrong time to open a new data processing center in this city.

The dynamic data that changes over time is also called _______ data. A:

中国大学MOOC: The data will need _______ from time to time.

How long did it take Christine to help Katherine analyze the data last time?

若要显示系统当前时间，应键入（）。 A: TIME B: DATA C: TIME12：30：12 D: TIME小时：分：秒

函数setcookie('data', 'PHP', time() + 1800)表示Cookie在1800分钟后过期

Which of the followings are correct about difference-in-difference(DID) quasi-experiment study? A: time series data can be used for DID analysis B: panel data can be used for DID analysis C: DID analysis compares the changes over time in an outcome of the treatment group to changes over the same time period in the outcome of the control group. D: DID analysis is the changes over time in an outcome of the treatment group

以下是日期格式的是（）。 A: date B: data C: time D: now