If the oxygen content is not greater than 21%, which of the following gases must be used to set the span point?

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Question:If the oxygen content is not greater than 21%, which of the following gases must be used to set the span point?

1.Oxygen

2.Dry air

3.Nitrogen

4.Hydrogen

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  1. If the oxygen content is not greater than 21%, which of the following gases must be used to set the span point?
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