Keithley产品的操作者必须防止电击危险。
Operators of Keithley products must be protected from electric shock at all times.
Keithley产品的用户应该具有合格资质，了解电击危险，熟悉避免可能伤害的安全防范要求。
Keithley products are intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required to avoid possible injury.
上排的第三个电闸贴着“危险：强电击”。
The third switch from the top was labeled, "Danger: Severe Shock".
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