(1) it is necessary to concentrate on the work, not only to keep a clear mind, but also to operate the electric tools rationally. It is forbidden to operate the machine after drinking......
(1) the professional electrician shall regularly replace the carbon brush of the percussion drill and check the spring pressure. (2) ensure that the whole body of......
Correct usage (1) before operation, it is necessary to check whether the power supply is consistent with the normal rated 220V voltage on the ......
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