单项选择题
Which of the following printer types uses thin print pins to transfer ink from a fiber or ribbon？ （）
A.impact
B.laser
C.solid ink
D.ink jet
单项选择题 Anewcomputerisdisplayingthewrongamountofmemory.Whichofthefollowingmaybethecause？（）
单项选择题 Atechnicianreceivesalaptopthatisrunningoutofbatterypowermorequicklythanexpected.Whichofthefollowingcanthetechniciandotocorrecttheproblem？（）
单项选择题 Whichofthefollowingwouldbethesafestenvironmentalconditionforworkingonmultiplesystemsatonetime？（）