81. 早產，流產 (A) omentitis (B) ophthalmechymosis (C) omotocia (D) omphalocele

9. Which statement regarding biases in demonstration studies is wrong? (A) Volunteer effect means volunteers perform better than others(B) Placebo effect means patients’ symptoms improve if “high tech” computers are presen(C) Hawthorne effect means subjects learn from the system, so performance improves on control cases (D)Checklist effect means performance improves if clinicians use a checklist