After booting up a new computer， a technician observes that the USB ports are not working with any USB devices. Which of the following should be done FIRST？（）
A: Check the computer to verify that the jumper settings for USB are correct.
B: Connect the USB devices to a different computer to test the devices.
C: Buy new USB wires and test USB functionality.
D: Check the BIOS to verify that USB functionality is enabled.
A: Check the computer to verify that the jumper settings for USB are correct.
B: Connect the USB devices to a different computer to test the devices.
C: Buy new USB wires and test USB functionality.
D: Check the BIOS to verify that USB functionality is enabled.
举一反三
- You have a computer running Windows 2000 Professional. You have purchased a new USB scanner. You attached it to the USB port. When you go to device manager to see the status of the USB port， you did not find any USB controller there. What should you do to resolve this problem？（） A: Update the scanner drivers using certified drivers B: Enable the USB port in the computers BIOS C: Enable the USB hub controller in device manager. D: Reinstall the USB device driver and disable the USB error detection
- You have a computer running Windows 2000 Professional. You have purchased a new USB scanner. You attached it to the USB port. Then you go to device manager to see the status of the USB port. The status of the USB port is shown below. What should you do to resolve this problem?() A: Update the scanner drivers using certified drivers B: Enable the USB port in the computers BIO C: D: Contact the maker or vendor for you system and obtain the current version of BIO E: F: Enable the USB hub controller in device manager.
- 学习7.3视频，根据视频改写usb应用程序如下。请将程序空缺位置补充完整： //定义出一个USB的标准 interface USB { // 操作标准 public void install(); public void work(); } //在电脑上应用此接口 class Computer { public void plugin(USB usb) { // 接收USB接口实例 第一空 ； // 调用install（）接口方法 第二空 ； // 调用work（）接口方法 } } //定义USB设备手机 class Phone implements USB { // 实现USB接口 public void install() { System.out.println("安装手机驱动程序。") ; } public void work() { System.out.println("手机与电脑进行工作。") ; } } //定义USB设备打印机 class Print implements USB { // 实现USB接口 public void install() { System.out.println("安装打印机驱动程序。") ; } public void work() { System.out.println("进行文件打印。") ; } } //连接USB设备 public class TestDemo { public static void main(String args[]) { Computer c = 第三空 ; //实例化Computer（） c.plugin(new 第四空 ) ; // 调用Phone设备相关操作; c.plugin(new 第五空 ) ; // 调用Print相关操作 ; } }
- USB, short for Universal Serial Bus, is a standard type of connection for many different kinds of devices.
- 请说出以下设备的名称: A: USB声卡 B: USB无线网卡 C: USB调制解调器 D: USB转RJ45