The second aspect is the test of the ground sense coil.
第二个方面是地感线圈的测验。
2
The third aspect is the device of the ground sense coil, and the ground sense coil is usually equipped with 2 in one lane.
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。
3
If you cannot test geothermal heating principle to the construction, and the ground is absolutely not allowed to drill hammer and hammer nails, to prevent the destruction of the heating coil.