高速公路车型收费模式下,车辆划分为几类?是按照什么特性划分的?
参考答案:
按照车型收费分为七类;是按照车辆的轴、轮和前轴轴心处地面至车顶的垂直高度的物理特性划分的。
---- Tony, you look puzzled. Have you understood me ?
---- I’m sorry. I _____ another problem just now.
A.thought of
B.am thinking of
C.had thought of
D.was thinking of
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