西方文明经历了三次民族主体的转换和文明中心的位移。
参考答案:对
Are all of the numbers in a certain list of 15 numbers equal ?() (1)The sum of all of the numbers in the list is 60. (2)The sum of any 3 numbers in the list is 12。
A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.
票据是体现一定财产权利的有价证券。