Second stage, dependence
I don't know, you didn't provide much to really answer anything.
Respiratory defense system.
It would be considered an at bat because the baserunner from second base did not score a run.
PPE or personal protective equipment should be put on in this order - first gown, second mask, third goggles, last gloves. The gown should always be put on first, fastened and secured, then the mask and secure the ties or elastic bands, then place the goggles over your eyes and over the mask ties and then put the on gloves last. The only thing you should then be touching is anything related to the patient.