单项选择题

A technician receives a printer that is printing ink smudges on random sheets of paper. Which of the following should the technician try FIRST？（）

A.Replace the printer.
B.Replace print head assembly.
C.Clean the print head.
D.Use a different brand of paper.

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单项选择题

Ashippingdepartmentisreportingthatalaserprinterinthereceivingareaisbecomingjammedbecausetheprinterattemptstopullseveralsheetsofpaperforeachprint.Whichofthefollowingmaybethecause？（）

A.Humidity is causing the paper to stick together.
B.The paper is sticking to the corona wire and causing the jam.
C.A4 paper is being used and may not be supported by laser printers.
D.The fusion roller is dirty and pulling too many sheets of paper.

单项选择题

WhichofthefollowingwouldbethemaximumnumberofdevicesinasinglechainthatUSBtechnologywillallow？（）

A.98
B.127
C.254
D.120