属于C-苷的是( )A.大豆素 B.葛根素 C.大豆苷 D.黄芩苷 E.芦丁 发布时间:2018-06-18 15:59 │ 来源:www.tikuol.com 题型:单项选择题 问题: 属于C-苷的是( )A.大豆素B.葛根素C.大豆苷D.黄芩苷E.芦丁
题型:单项选择题 如图所示为一物体做匀变速直线运动的速度-时间图象,根据图线做出的以下几个判断中,正确的是[ ]A.物体始终沿正方向运动 B.物体先沿负方向运动,在t=2s后开始沿正方向运动 C.在t=2s前物体位于出发点负方向上,在t=2s后位于出发点正方向上 D.在t=2s时,物体距出发点最远 查看答案
题型:单项选择题 Traditional IP packet forwarding analyzes the____(1)____IP address contained in the network layer header of each packet as the packet travels from its source to its final destination.A router analyzes the destination IP address independently at each hop in the network.Dynamic ____(2)____protocols or static configuration builds the database needed to analyze the destination IP address(the routing table).The process of implementing traditional IP routing also is called hop—by—hop destination—based____(3)____routing.Although successful,and obviously widely deployed,certain restrictions,which have been realized for some time,exist for this method of packet forwarding that diminish its____(4)____.New techniques are therefore required to address and expand the functionality of an IP—based network infrastructure.This first chapter concentrate on identifying these restrictions and presents a rew,architecture,known as multipIeprotocol____(5)____switching,that provides solutions to some of these restrictions.(1)A.datagramB.destinationC.connectionD.service 查看答案