One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； Question 313
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True or False: In situations where the concentration of toxic gases exceeds 2% of the total volume and the oxygen level is below 18% of the total volume, all types of gas masks become ineffective. ( ) Reason: ( ) Answer: √. High concentrations of toxic gases and low oxygen levels make it easy to suffer from suffocation when using gas filters.
Correct------The reason is that when the oxygen concentration is below 18%, asphyxiation occurs; a gas concentration of 2% exceeds the gas-proof threshold of the mask
When the concentration of toxic gases exceeds 2% of the total volume and oxygen constitutes less than 18% of the total volume, all types of gas masks become ineffective; an isolated type of gas mask should be used instead.
Correct √. 1. The oxygen concentration must be above 18%; otherwise, although people will not be poisoned, they can still suffer from oxygen deprivation and suffocation. 2. In non-enclosed environments, it is necessary to prevent the oxygen concentration from dropping below 18%. 3. The concentration of toxic gases must be below the breakthrough concentration of the mask, otherwise the mask will no longer be able to provide filtration. 4. The operation time should not be too long, as staying in a toxic environment for an extended period will cause the agents inside the mask to gradually become saturated and ineffective.
It is unable to provide the oxygen that people need
My answer is: Wrong, because the protector that supplies air can still be used.
The oxygen concentration is insufficient; it needs to be between 19.5% and 23.5% to ensure proper breathing for people
When the concentration of toxic gases exceeds 2% of the total volume and the oxygen concentration is below 18% of the total volume, all types of gas masks become ineffective. (√) The reason is that when the concentration of toxic gases is above 2% of the total volume, the gas mask stops working; and when the oxygen concentration is below 18% of the total volume, the gas mask cannot supply oxygen and thus also becomes ineffective
4. In situations where the concentration of toxic gases exceeds 2% of the total volume and oxygen constitutes less than 18% of the total volume, all types of gas masks become ineffective
True or False: In situations where the concentration of toxic gases exceeds 2% of the total volume and oxygen constitutes less than 18% of the total volume, all types of gas masks become ineffective. (True) Reason: (I don’t know.)