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【单选题】Scarcely had they settled themselves in their seats in the theatre ______ the curtain went up.
A.
then
B.
before
C.
when
D.
then
【单选题】Scarcely had they settle themselves in their seats in the theatre ______ the curtain went up.
A.
than
B.
when
C.
before
D.
as
【简答题】完形填空。 Every Saturday night Mama would sit down by the table and count out the money Papa had brought home. Mama would carefully divide big groups for the housing, and food, and one or two coins for Ne...
【单选题】Scarcely ________ ourselves in the theatre when the curtain ______ up.
A.
had we seated; went
B.
we had seated; went
C.
seated; had gone
D.
did we seated; had gone
【简答题】（）它是从严格周期修理制度发展为以状态为主的项目修理制度。每个制度虽然也有周期，但仅作参考，主要依据设备状态来确定修理时间和内容。防止过维修和欠维修现象的发生。
【多选题】下列有关阐述正确的是( )。
A.
扩大时距法是扩大指标所属的时间,从而反映现象发展的变动趋势
B.
长期趋势的测定主要是求趋势值
C.
移动平均法是指对动态序列进行逐期移动以扩大时距,同时对时距已扩大了的新动态序列的各项指标值分别计算序时平均数,从而由移动平均数形成一列派生动态序列的方法
D.
最小二乘法又称最小平方法,是估计回归模型参数的常用方法
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