在听磁带式录音机的录音时经过20分钟带轴上带卷的半径会减�.那么从此刻到带卷的半径变成起始半径的一半时经过的时间为a8分钟b7分钟 Template




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tomski在听磁带式录音机的录音时经过20分钟带轴上带卷的半径会减�.那么从此刻到带卷的半径变成起始半径的一半时经过的时间为a8分钟b7分钟 coloring