宪法制定是一种（）行为
A. 非主权
B. 主权
C. 实施
D. 保障
在法律实施以前，依照法定程序，由审查机关予以审查是（）
A. 事后审查
B. 事前审查
C. 附带审查
D. 专门审查
AtechnicianistroubleshootingalaptopLCD,andwhenthecoverisopenednothingshowsonthescreen.Thenallofasuddenthescreencomesonandworksfine.WhichofthefollowingshouldthetechniciancheckFIRST?（）
A. Backlight
B. Inverter
C. Loosecable
D. Lidswitch
HowdoestheERXEdgeRouterinteractwithsubscriberIPaddressesassignedbyanexternalDHCPserver?（）
A. Itmonitorsmessagesfromtheexternalserverandupdatestheroutingtableasneeded.
B. ItmaintainstheleasesfortheDHCPserverandreassignsaddressestonewsubscribers.
C. Itsendskeepalivestothesubscriberandmakestheaddressavailablewhenthesubscriberstopsresponding.
D. Itsendskeepalivestothesubscriberandremovesthehostroutewhenthesubscriberstopsresponding.
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