采样控制系统中广泛采用的保持器是零阶保持器。

单项选择题Which of the following can best summarize the main idea of the passage?A.With no Retriever, thousands of laptops are stolen every year.B.A new software provides a means to reduce laptop theft.C.Retriever has helped to find thieves and lost computers.D.A new program offers a communication platform. with the thieF.

单项选择题Don’t worry if you don’t understand everything.The teacher will ______ the main points at the enD.A.recover B.review C.require D.remember