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【单选题】
当边际产量大于平均产量时A.
平均产量递增
B.
平均产量递减
C.
平均产量不变
D.
平均产量先增后减
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举一反三
【简答题】前轮驱动汽车的主减速器常用的四种传动形式是（）齿轮传动、（）齿轮传动、（）齿轮传动和（）式传动。
【简答题】前轮驱动汽车的主减速器常用的四种传动形式是______齿轮传动、______齿轮传动、______齿轮传动和______传动。
【简答题】前轮驱动汽车的主减速器常用的四种传动形式是斜齿轮传动、 齿轮传动、准双曲面齿轮传动和链轮式传动。
【单选题】听力原文：I' m honored to be here today. One of my favorite things to do is to talk with business students about building a successful company. After I graduated from business school, I established my own ...
A.
Advertising
B.
Property management
C.
Building renovation
D.
Accounting
【简答题】前轮驱动汽车的主减速器常用的四种传动形式是斜齿轮传动、( )齿轮传动、准双曲面齿轮传动和链轮式传动。
【单选题】The word 'burnout' (Para.5, Line 3)here refers to the state of ______.
A.
being seriously burnt in the skin
B.
being unable to burn for lack of fuel
C.
being completely damaged by fire
D.
being unable to function because of excessive use
【单选题】When I moved to the city two years ago, the government _____ several modern buildings here. [ ]
A.
built
B.
will build
C.
had built
D.
has built
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