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【单选题】
计量法规体系可分为（? ）个层次，《中华人民共和国强制检定的工作计量器具检定管理办法》属于第（??? ）层次。A.
三，二
B.
三，三
C.
四，二
D.
四，三
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反馈参考答案：
举一反三
【简答题】城市轨道车辆中采用的主要有( )空气压缩机和( )空气压缩机两种。
【简答题】城轨车辆中采用的主要有活塞式空气压缩机和 空气压缩机两种。
【简答题】Some say college is wasted on the young. So many of us look back at our own college years and realize what we could have done differently to make the most of them. While we can’t go back, we certainly...
【单选题】The dropout rate of college students seems to go up because ______.
A.
young people are disappointed with the conventional way of teaching at college
B.
many people are required to join the army
C.
young people have little motivation in pursuing a higher education
D.
young people don't like the intense competition for admission to graduate school
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