A.glass cleaner B.a simple ammonia and water solution followed by an antistatic solution C.a bleach solution followed by water D.compressed air
单项选择题Whenreplacingapowersupply，whatMUSTthetechnicianobserve？（）
A.voltage B.current C.wattage D.resistance
单项选择题WhichIPblockisdesignatedforprivatenetworkuse？（）
A.127.0.x.x B.169.0.x.x C.190.100.x.x D.192.168.x.x
