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1.?2013????????????????�???????????�??????????????????????d??????C????????????C??????????????d?????????????????C?d??????????( A

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2??2013???????????????r0?????????????????????????????r???????????????r1?r2?????

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B?A?????????A??B

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A????AC???????????????

B????AC????????????????

C. ???UAB = UBC

D????A < ?B < ?C

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6.?2012�?????????A?B??????Q??????r?3r??A?B????????????( C)

A?3?1 B? 1? 3 C?9?1D?1?9

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A????AC??????????????? B????AC???????????????? C. ???UAB = UBC D????A < ?B < ?C ???B

?????????????????AC??????????????????A????????????????????A?C?????

????????????????????B?????????????????UAB <UBC,??C??????A > ?B >?C???D?? ?

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