According to "Urban Road Engineering Design Code" (CJJ 37-212), how many grades are urban roads divided into( )?[单选题](

lk2025-04-01  5

题目:According to "Urban Road Engineering Design Code" (CJJ 37-212), how many grades are urban roads divided into( )?[单选题](2.0)

A. two

B. three

C. five

D. four

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