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【单选题】
变异指标中，（ ）是各变量值与其算术平均数的离差的绝对值的算术平均数。它是“先平均，再求差，然后再平均”。A.
修正距
B.
方差
C.
平均差
D.
标准差
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举一反三
【单选题】If the amount ______ that figure, payment by letter of credit will be
A.
exceed, required
B.
exceeds, required
C.
exceed, requiring
D.
exceeds, requiring
【简答题】三投影面展开时侧投影面的旋转是V面不动,W面向右旋转90°与( )面重合。
【单选题】He was elevated to the post of prime minister.
A.
pulled
B.
promoted
C.
lifted
D.
treated
【简答题】A) elevated B) merciful C) contented D) grateful
【单选题】He was elevated to the post of prime minister.
A.
promoted
B.
pulled
C.
lifted
D.
treated
【单选题】Overhead railway, (whose) tracks (are elevated out of) the way of surface traffic, (might have been) (one possible solution to) heavy traffic in big cities.
A.
whose
B.
are elevated out of
C.
might have been
D.
one possible solution to
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