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Q：During test of cleanliness, if 10 points are tested, of which cleanliness is exceeded only at 1 point, but the value of cleanl
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A：In principle, cleanliness at each test point should meet the standard; if cleanliness is exceeded at 1 point, it’s most likely be caused by HEPA leakage, dead space of air flow, improper position of equipment or adjacent source of pollution, which can be improved. And such case is in low probability.