Because of complex landform and big difference of elevation, transmission line in mountain area has its characteristics which are different form transmission line in common landform.

山区送电线路因其地形复杂、相对高差大，在许多方面都具有不同于普通地形送电线路的特点，对设计工作和勘测工作有更高的要求。

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The conditions of complicated topography and great difference of elevation are often met during water and hydroelectric surveys. So it is difficulty to carry out geometric elevation.

在水利水电测量中，常常遇到地形复杂，高差变化大的情况。

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Its application range, i. e. great elevation difference and bad condition of foundation, are pointed out.

指出高架式布置的应用范围，即最适宜轧线标高差较大、地基条件差的车间。

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