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【简答题】
铸铁与碳钢的区别在于有无()。 A莱氏体 B珠光体 C体 D渗碳体
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皮皮学刷刷变学霸
举一反三
【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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