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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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