According to the passage, we can see that______.
A.the speed of sound is only half that of a Concorde
B.the rocket is the fastest and least difficult means of travel
C.a supersonic plane can fly the Pacific in only eighteen minutes
D.people will spend less time on the ground as air travel is getting faster
第2题
A.路由环路,抑制计时器
B.交换回路,水平分割
C.路由环路,水平分割
D.交换回路,VTP
E.路由环路,STP
F.交换回路,STP
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