单项选择题
A customer has installed a new computer on their network. They can print to the printer but the option for duplex printing is not available. All other computers have the option. Which of the following is the cause of the problem？（）
A.The new computer is printing to the wrong IP address. B.The new computer is using the wrong protocol. C.The driver port is not setup correctly. D.The option has not been selected on the driver.
单项选择题 Whenisitadvisabletodumpthewastetonerfromatechniciansservicevacuum？（）
单项选择题 HowmanyCCDsarelocatedinasinglepassduplexADF？（）
单项选择题 Whichofthefollowingutilitiescouldbeusedtodetermineasubnetmask？（）
