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【单选题】
若某厂商按50%的比例同时增加某产品的各种生产要素,使该产品的产量提高了60%,则这种情况属于规模报酬( )。
A.
递增
B.
递减
C.
不变
D.
不能确定
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A.
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B.
was; moved
C.
has been; moved
D.
was; has moved
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【单选题】—He's never late for school, _________? —_____, never. He always gets to school on time.
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B.
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D.
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【单选题】如下金属中具有面心立方晶体结构的是_____
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【单选题】---When did he meet his wife for the first time？ ---It was _________ he came back from Africa that year _________ he met his wife.
A.
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B.
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C.
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D.
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【单选题】棘皮体动物的运动依赖的器官是( )。
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【单选题】Look! How excited he is! It is the first time that he________so excited since he________here last year. [     ]
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【简答题】David: Really? Well, then (4)_______________ ____—go to the store with me? I wanna return this camera.A. could you do me a favor B. could I ask you a favor
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D.
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【单选题】棘皮体动物的运动依赖的器官是( )。
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