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【单选题】
第一代计算机网络的特点是A.
遵循国际标准化协议
B.
以单机为中心
C.
宽带综合业务数字化网络
D.
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【简答题】5m长钢轨轨距检查为____________、____________两处。
【单选题】Paper produced every year is the world’s production of vehicles.
A.
the three times
B.
three times the weight of
C.
as three times heavy as
D.
three times as heavier as
【单选题】Paper produced every year is theworld’s production of vehicles ．
A.
． the three timesweight of
B.
． three times theweight of
C.
． as three tirues heavy
D.
． three times asheavier as
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