Engine : Expired / Engineering Safety - 943/275
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| Which of the following statements is true regarding oxygen indicators? |
| A) The instrument is capable of providing an immediate accurate reading of any space with no delay. |
| B) A cotton filter placed in the end of the sampling tube prevents damaging the instrument when exposed to strongly acidic gases. |
| C) Prolonged exposure to gases such as CO2 may affect the accuracy of the indicator. |
| D) All of the above. |
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