WhenconfiguringaPOSsystem,whichofthefollowingperipheraldeviceswouldMOSTlikelyneedtobeinstalled?()
A. Opticalmouse
B. Handhelddigitizer
C. Barcodereader
D. Touchscreen
E. Documentscanner
F. Keyboard
G. ExternalUSBdrive
网络系统的主要安全威胁是()等。
A. 网络操作系统
B. 黑客攻击
C. 计算机病毒和拒绝服务
D. 安全产品及管理
AlaptopoperatesonbatterypowerwhenconnectedwithanACadapter.Oncethebatterydischarges,thecomputerturnsoffandwillnotturnbackon.WhichofthefollowingaretheMOSTlikelycausesofthelaptopissue?()(SelectTWO).
A. TheLCDmonitor’spowerinverterdoesnotfunctionproperly.
B. Theoperatingsystem’spowersettingspreventthebatteryfromcharging.
C. Thebatteryisnotcompatiblewiththelaptop.
D. Theinternalpowerconnectiononthemotherboardisfaulty.
E. Thepoweradapterisnotworking.
检查闸瓦磨耗情况,闸瓦厚度应大于(),否则应更换
A. 10mm
B. 15mm
C. 20mm
D. 25mm