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【简答题】
直接写得数。 3+1= 8-5= 2+5= 4-3= 8-6= 8-7= 3+4= 9+0= 7-3= 7-0= 5-5= 5+4= 6+2= 1+8= 4-2= 6-2= 5-2= 3+6= 9-6= 6+1=
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反馈参考答案：
举一反三
【单选题】The amount by which total cost rises when the firm produces one additional unit of output is called
A.
average cost.
B.
marginal cost.
C.
fixed cost.
D.
variable cost.
【简答题】n. the amount by which one thing is different from another
【判断题】A debt overhang means that the amount by which the debt obligations exceed the present value of the payments that will be made to service the debt.
A.
正确
B.
错误
参考解析：
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