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【简答题】
某厂生产的化纤纤度服从正态分布N(u，0.04 2 )，现测得25根纤维的纤度，其样本均值 ，试用p值法检验总体的均值是否为1.40。
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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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