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【单选题】
将50个数据分成5组列出频数分布表,其中第一组的频数为6,第二组与第五组的频数和为20,那么第三组与第四组的频数和为 [     ]
A.
20
B.
24
C.
26
D.
31
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为腹式呼吸的主要肌肉
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B.
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B.
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D.
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E.
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