单项选择题
A.二类 B.三类 C.四类 D.五类
A.单轴双轮 B.双轴双轮 C.三轴双轮 D.异型轴
A.7吨 B.17吨 C.18吨 D.14吨
A.Excuese me，please. B.May I help you. C.Wait a minute，please. D.Take minute.
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