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【单选题】
柱子安装时,经纬仪应安置在与柱子的距离约为 ( ) 倍柱高处进行竖直校正。同截面的柱子,可把经纬仪安置在轴线一侧校正几根柱子的铅直;变截面柱子的校正,必须将经纬仪逐一安置在各自的有关纵向或横向柱轴线上。A.
． 1
B.
． 1.5
C.
． 2
D.
． 0.5
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举一反三
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【单选题】螺管型差动变压器的衔铁和铁芯用同种材料制成,通常选
A.
电阻率大，导磁率高，饱和磁感应大的材料
B.
电阻率大，导磁率高，饱和磁感应小的材料
C.
电阻率大，导磁率低，饱和磁感应大的材料
D.
电阻率小，导磁率高，饱和磁感应大的材料
【简答题】At ___, Yang joined a __________________ and ever since fell in love with a popular dance that imitates the movements of the ________.
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