Whichtwostatementsaccuratelydescribeabroadcastdomain?（）
A. Broadcastdomainsrequierethattheparticipatingdevicesconnecttocommonswithcesorhubs
BroadcastdomainsconsistofdevicesreachablebyframesaddressedtotheLayer2broadcastaddress
C. Broadcastdomainsrequiereagatewaydevicesucharouter
D. BroadcastdomainsconsistofdevicesthatresideonthesameVLAN
社会策划的基本原则包括：（）
A. 客观性原则
B. 效益性原则
C. 权变性原则
D. 可行性原则
Whencomparinganalogdisplayinputstodigitaldisplayinputs,whichofthefollowingisanadvantagethatdigitalhasoveranalog?（）
Allowsforhigherbrightness
B. Morecrosstalk
C. Sustainshigherresolutions
D. Supportswidescreenresolutions
t 值为2.58 ，所对应的置信度为（）
A. 90%
B. 95%
C. 99%
D. 95.45%
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