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【单选题】
已知产量为500单位时，平均成本是2美元，产量增加到550单位时，平均成本等于2.50美元。在这个产量变化范围内，边际成本( )A.
随着产量的增加而上升，并在数值上大于平均成本。
B.
随着产量的增加而上升，并在数值上小于平均成本。
C.
随着产量的增加而下降，并在数值上大于平均成本。
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皮皮学刷刷变学霸
举一反三
【单选题】The napkin is used only for
A.
your forehead.
B.
your mouth.
C.
your nose.
D.
your face.
【单选题】[音频] an even dozen 12 a baker's dozen 13
A.
The interest rates were much higher in the past than now.
B.
The economy has had no effect on the interest rate.
C.
The interest rates have risen a lot.
D.
The interest rates cotinue to drop.
【简答题】Offer 5000 dozen sport shirts sampled March 15th USD84.50 per dozen CIF Newyork export standard packing May/June shipment irrevocable sight L/c subject reply here 20th.
【单选题】[音频] an even dozen 12 a baker's dozen 13
A.
Twelve cookies were given to them.
B.
They were given more cookies than they expected.
C.
Six cookies were given to them.
D.
They were given less cookies than they expected.
【单选题】There was only one ____ of transportation in this mountainous area five years ago.
A.
mean
B.
means
C.
meaning
D.
way
【单选题】Shortly after the accident, two ______ policemen came to the spot.
A.
dozen of
B.
dozens
C.
dozen
D.
dozens of
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