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介绍一台新研制的激光扫平装置．它在激光水平仪基础上加一套转镜装置以获得基准水平面，独特设计的光电探测器接收扫平光束，并给出水平面位置的指示信号．
Introduce a newly developed laser sweeping device. It is based on the laser level gauge plus a mirror device to obtain a reference level, the unique design of the photodetector to receive the level beam, and gives a signal indicating the horizontal position.