Leave the lab on time, turn off the operating system before leaving, turn off the mainframe power supply of the computer, and turn off the power supply of the display. Push the bench in the table and put it back in place. 按时离开实验室,离开前关闭操作系统,关闭计算机主机电源,关闭显示器电源。把凳子推到桌子里,放回原处。 Are you sure you know? 你确定你知道吗 ?