When is it advisable to dump the waste toner from a technicians service vacuum?()
A. When it is full.
B. It is not recommended.
C. Before performing preventative maintenance.
D. After each call.
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.
CO的爆炸下限为()。
A. 5.35%
B. 4.15%
C. 17.1%
D. 12.5%
下列描述中正确的是()。
A. 激光打印机是击打式打印机
B. 击打式打印机价格最低
C. 喷墨打印机不可以打印彩色效果
D. 计算机的运算速度可用每秒执行指令的条数来表示