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仪器外壳必须有效接地，以保证使用安全。
The outer plate of the instrument must be grounded properly, for safety of operation.
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盘柜外壳和基础槽钢应可靠的接地。
The cover and channel steel should earthed reliably.
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盘柜外壳和基础槽钢应可靠的接地。
The cover and channel steel should earthed reliably.
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