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【简答题】
最常见的斜坡运动是( )、( )和( )。
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反馈参考答案：
举一反三
【简答题】试证明： 设 .若E'是可数集，则E是可数集．
【单选题】听力原文：If you only need to travel a short distance, the quickest way to travel in most cities is to walk. During working hours(between approximately 9:00 a. m. and 5:00 p.m. Monday through Friday), the ...
A.
By car.
B.
On foot.
C.
By taxi.
【单选题】听力原文： If you only need to travel a short distance, the quickest way to travel in most cities is to walk. During working hours( between approximately 9:00 a. m. and 5:O0 p. m. Monday through Friday), t...
A.
By car.
B.
On foot.
C.
By taxi.
【单选题】听力原文： If you only need to travel a short distance, the quickest way to travel in most cities is to walk. During working hours ( between approximately 9:00 a.m. and 5:00 p.m. Monday through Friday), ti...
A.
By car.
B.
On foot.
C.
By taxi.
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