西湖龙井的品质特点是外形扁平光滑,形如“碗钉”:汤色碧绿、滋味甘醇鲜爽。
参考答案:对
图表示部分动物进化树,序号代表不同的动物类群,请据图中各类群的自述判断正误(正确的打“√”,错误的打“×”)
(1)①的自述。( )
(2)②的自述。( )
(3)③的自述。( )
(4)④的自述。( )
Open Shortest Path First(OSPF)is a (29) routing algorithm that (30) work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (31) processing power. The Dijkstra algorithm is used to calculate (32) OSPF routing table updates only take place when necessary, (33) at regular intervals.
30()
A.derived from
B.deviated from
C.was derived from
D.was deviated from