单项选择题
A. The Java applet is disabled in the web browser.
B. Deny all has not been configured in the firewall.
C. Wireless network drivers are corrupt.
D. Port forwarding settings are not correct
单项选择题 A technician is setting up a new inkjet printer and notices that the images appear hazy. Which of the following should the technician perform FIRST to resolve the issue?（）
单项选择题 Which of the following should a technician MOST likely use to test a RS-232 port?（）
单项选择题 The technician has replaced a power supply with an identical power supply, and now the high end graphics card is not working. Which of the following should the technician check?（）