让我们试着测量垂线间距。

Let's try to measure the length between perpendiculars.

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铅垂线总是垂直于水平面的。

Water always finds its own level.

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铅垂线总是垂直于水平面的。

The plumB line is always perpendicular to the horizontal plane.

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步骤6：从这一点划垂线向下与横轴相交。

Step 6: From this point draw a vertical line down to the horizontal axis.

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以及国际上遥测垂线座标仪的发展趋势提供了各种性能试验和现场运行的资料。

The paper also presents the technical information of its indoor performance test and in-situ service.

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以及国际上遥测垂线座标仪的发展趋势提供了各种性能试验和现场运行的资料。

The paper also presents the technical information of its indoor performance test and in-situ service.

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