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单项选择题下面是按―四舍六入五凑偶‖的舍入规则把各有效数字取为4位,正确是的()

A、21.495=21.50,34.465=34.47,6.1305×105=6.131×105

B、8.0130=8.013,1.798501=1.798,0.0028760=0.0029

C、8.0130=8.013,1.798501=1.798,0.0028760=2.876×10-3

D、21.495=21.49,34.465=34.46,6.1305×10^5=6.131×105

  • C
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