Discussion
Which efficiency does a wall flow filter typically achieve?
Answer: B
Wall flow filters remove well over ninety per cent of the particulates. The last option adds the number efficiency, which makes it a correct and fuller version of the same answer. Checking which component actually carries the load settles most questions of this kind at once. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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