224.Regarding safety helmet precautions, which of the following statements isincorrect? (A) A helmet that has been subjected to impact can still be usednormally if the exterior shows no damage, without replacement. (B) The chinstrap length should not be too long or too short, leaving about one finger'swidth of space. (C) The buckle should be under the chin, leaving one finger'sspace, and the knob should be tightened.