题目内容

望远镜的视准轴应垂直于它的水平轴。()

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______ The purpose of this passage is to explain why it is necessary for us to help others.

采用盘左、盘右取平均的方法可以消除竖盘指标差对竖直角的影响。()

Many people trained abroad remain in the developed countries instead of_________

在对水平度盘读数前，应使竖盘指标水准管气泡居中。()