The students asked _________________.

A．when can they surf the Internet in class

B．when could they surf the Internet in class

C．when they could surf the Internet in class

D．when they can surf the Internet in class

算法的时间复杂度是指( )。

A．算法的执行时间

B．算法所处理的数据量

C．算法程序中的语句或指令条数

D．算法在执行过程中所需要的基本运算次数