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关注:1
2013-05-23 12:21
求翻译:Ultrasonic vehicle detectors began to be used in the mid-1950s. Michigan, Illinois, New York and California were among the early users是什么意思? 待解决
悬赏分:1
- 离问题结束还有
Ultrasonic vehicle detectors began to be used in the mid-1950s. Michigan, Illinois, New York and California were among the early users
问题补充: |
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