第二个方面是地感线圈的测验。
第三个方面是地感线圈的装置，地感线圈在一个车道上通常装置2个，前后各一个。
The third aspect is the device of the ground sense coil, and the ground sense coil is usually equipped with 2 in one lane.
在道闸门禁系统接好线时，就能够对地感线圈进行测验了，不要比及埋好地感线后才测验。
In the gate guard system connect the wire, you can test on the induction coil, don't wait for good sense buried line after test.
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