本机必须正确接地，确保安全。
将本机电源线之地线接地（黄绿色线）或从机壳螺丝钉接地。
Earth the ground wire (yellow-green wire) of the machine or earth it by the screw of the shell.
本机的电气设备应接地，并将电线装在绝缘管内。
The electric devices of equipment shall be earthed and line shall be in insulating tube.
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