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单选题

The ratio of width to depth must be 30 or more at each point.

A每-一个点处的宽度和深度值不能小于30.

B每-一个点处的宽深值不能大于30.

C每-一个点处的宽深比不少于30.

正确答案:A (备注:此答案有误)

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