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我国上海建成世界第一条高速磁浮交通系统--上海磁浮示范运营线于2002年12月31日正式通车,磁浮列车从上海市地铁车站到国际机场全程30km,单程行驶只用8min,它的平均速度为______km/h,上海磁浮列车已达到设计的最高时速430km/h.它能悬浮在轨道上运行,是因为利用了______的原理.
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举一反三
【单选题】在气孔张开时,水蒸气分子通过气孔的扩散速度
A.
与气孔面积成正比
B.
与气孔周长成反比
C.
与气孔周长成正比
D.
不决定于气孔周长,而决定于气孔大 小
【单选题】在气孔张开时,水蒸气分子通过气孔的扩散速度
A.
与气孔的面积成正比
B.
与气孔周长成正比
C.
与气孔周长成反比
D.
与气孔面积成反比
【单选题】施工图预算文件的审查,应当委托具有相应资质的( )机构进行。
A.
财务管理
B.
会计审查
C.
工程造价咨询
D.
工程核算
【单选题】During the late sixteenth and early seventeenth centuries, the London district of Southwark was prospering (繁荣的), and a very important and far-reaching development was taking place at Bank side, and a...
A.
the style. of its buildings
B.
Shakespeare's performances at the Globe Theater
C.
its influence (影响) on public taste
D.
the number of plays produced there
【单选题】It can be inferred from the passage that Chinese observations of the Sun during the late seventeenth and early eighteenth centuries______.
A.
are ambiguous because most sunspots cannot be seen with the naked eye
B.
probably were made under the same weather conditions as those made in Europe
C.
are more reliable than European observations made during this period
D.
record some sunspot activity during this period
【单选题】在气孔张开时,水蒸气分子通过气孔的扩散速度
A.
与气孔面积成正比
B.
与气孔周长成反比
C.
与气孔周长成正比
D.
与气孔大小成正比
【单选题】在气孔张开时间水蒸气分子通过气孔的扩散速度
A.
与气孔面积成正比
B.
与气孔周长成正比
C.
与气孔周长成反比
D.
不决定于气孔周长,而决定于气孔大小
【单选题】在气孔张开时,水蒸气分子通过气孔的扩散速度
A.
与气孔的面积成正比
B.
与气孔周长成正比
C.
与气孔周长成反比
【简答题】施工图预算文件的审查,应当委托具有相应资质的()进行。
【单选题】According to the passage, the changes in higher education during the late 100's were the result of ______.
A.
plans developed by conservatives and church leaders
B.
efforts of interested individuals to redefine the educational system
C.
the demands of social organizations seeking financial relief
D.
rallies held by westerners
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