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【单选题】

The estimate is based on the
A.direction of the hill

B.accepted speed of sound
C.interval between sound and echo
D.both B and C
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根据网考网移动考试中心的统计,该试题:

9%的考友选择了A选项

21%的考友选择了B选项

66%的考友选择了C选项

4%的考友选择了D选项

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