以下关于固定电话网特点的叙述中,不正确的是()
A、采用同步时分复用D
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Matteristhename________(give)toeverythingwhichhasweightandoccupiesspace.
如图,连续函数y=f(x)在区间[-3,-2],[2,3]上的图形分别是直径为1的上、下半圆周,在区间[-2,0],[0,2]的图形分别是直径为 则下列结论正确的是()
Theassociationis________toraisingfundstohelptheblind.
Theenginehasbrokenandtheboatis______onthewater.
heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.