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【单选题】
It can be inferred from the passage that the author most probably believes which of the following to be true concerning those historians who study the history of women?A.
Their work provides insights important to those examining social phenomena affecting the lives of both sexes.
B.
Their work can only be used cautiously by scholars in other disciplines.
C.
Because they concentrate only on the role of women in the work-place they draw more reliable conclusions than the other historians.
D.
Their work has not had an impact on most historians' current assumptions concerning the revolutionary effect of technology in the work-place.
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【简答题】若 为实数，且 ，则以 为根的一元二次方程（二次项系数为1）是
【单选题】新生儿期应接种的疫苗是
A.
乙肝疫苗、麻疹减毒活疫苗
B.
卡介苗、乙肝疫苗
C.
卡介苗、麻疹减毒活疫苗
D.
脊髓灰质炎减毒活疫苗、百白破疫苗
E.
乙脑减毒疫苗、麻疹减毒活疫苗
【简答题】若 、 为实数，且 ，则 ＝ ▲ ．