下列各式一定正确的有几个
(1)a5+a5=a10;(2)a6×a4=a24;(3)a0÷a-1=a;(4)a4-a4=a0. [ ]
A.1
B.2
C.3
D.4
答案:A
下列各句中,没有语病的一句是 [ ]
A、教育部日前下发《关于做好2009年普通高等学校招生工作的通知》,鼓励各省采取平行志愿投档,努力降低新生报到流失。
B、全球变暖引发的极端天气气候事件频繁发生,暴露出当前重大气象灾害防御工作还面临着不少难点问题有待解决。
C、我省药品食品监督部门已着手对全省食品生产企业按照诚信度等级进行分类管理,不良记录的多少,将直接影响企业的诚信等级。
D、去年最火的电视剧要算《士兵突击》,它记载了普通士兵的心路历程,讲述了一个中国军人的传奇故事。它生动感人的故事情节是观众备受喜爱的。
Traditional network layer packet forwarding relies on the information provided by network layer (1) protocols, or static routing, to make an independent (2) decision at each hop within the network. The forwarding (3) is based solely on the destination (4) IP address. All packets for the same destination follow the same path across the network if no other equal-cost paths exist. Whenever a router has two equal-cost (5) toward a destination, the packets toward the destination might take one or both of them, resulting in
空白(2)处应选择()
A.forwarding
B.connecting
C.routing
D.killing