单项选择题

函数项级数的收敛域是（）.‏

A．

B．

C．

D．

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单项选择题

Immizerising growth refers to a: A.
decrease in the commodity terms of trade and increase in the income terms of trade B.
decrease in the welfare of a nation with growth C.
decrease in the income terms of trade and an increase in welfare D.
any of the above.

单项选择题

29. We invite your attention to the fact（）your L/C has not reached us in spite of our repeat requests.
A. that

B. what

C. where

D. how