熔断器是一种当流过熔体的电流超过限定值时，利用熔体熔化作用而切断电路的保护装置。主要用于（）和（）保护。
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某投资项目的计算期为5年，净现值为10000元，行业基准折现率为10%，5年期、折现率为10%的年金现值系数为3.791，则该项目净现值的等额年金为（）元。
A. 2000.00
B. 2637.83
C. 37910.26
D. 50000.83
what does THEwomaIl mean?/imgcache/attached/media/20140228/20140228171540_8224.mp3
A. They shouldn’t change their plan．
B. They should change their mind．
C. Weather forecasts are not reliable．
D. The tennis game won’t last long．
what’S wrong with the man?/imgcache/attached/media/20140228/20140228171540_8224.mp3
A. He has got a cold．
B. He wants to die．
C. His dog is sick．
D. He throws up seriously．
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