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【单选题】
玻色分布和分布过渡为玻耳分布的条件为（）A.
e a >>1
B.
高温
C.
低密度
D.
e a <<1< /div>
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举一反三
【单选题】Which of the following best explains the competition between digital wallet and payment card?
A.
Most commerce still involves cash and cheques, so payment cards are hard to remove.
B.
Phone-based payments systems such as M-pesa will spread throughout the world.
C.
The joint ventures combined the innovative firms with card firms will occupy the market all over the world.
D.
Though mobile payment will cover all over the world, the card firms are not easy to give up the market.
【简答题】FANUC系统数控铣床在使用G94指令时,进给功能F的单位是( ),是数控铣床常用的进给单位。
【单选题】Baggage placed in other places should _____.
A.
have an I.D. tag on it
B.
be looked after by a stewardess
C.
not be far from the owner
D.
not have any tags on them
【简答题】在没有泄露的情况下,根据泵的几何尺寸计算得到的流量称为( );泵在规定转速和额定压力下输出的流量称为( );泵在某工作压力下实际输出的流量称为( )。
【单选题】液压泵单位时间内排出油液的体积称为泵的流量。在没有泄露的情况下, 根据泵的几何尺寸计算而得到的输出流量,它等于排量和转速的乘积,称为( )
A.
实际流量
B.
理论流量
C.
排量
D.
额定流量
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