感光材料未经曝光，直接显影后产生的密度为（）
A.灰雾度
B.本底灰雾
C.最大密度
D.片基灰雾
E.乳剂灰雾
参考答案：B
A nurse in a prenatal clinic is assessing a 28-year-old woman who is 24 weeks pregnant. Which of the following findings would lead this nurse to suspect that the client has mild preeclampsia
A. Hypertension, edema, proteinuria.B. Glycosuria, hypertension, seizures.C. Hematuria, blurry vision, reduced urine output.D. Burning on urination, hypotension, abdominal pain.
女性，45岁，右上腹疼痛2天来诊。体检：巩膜黄染，体温39℃，右上腹肌紧张，压痛(+)。B超：胆管轻度扩张，胆管内有结石，如不及时治疗，最严重的并发症是
A．休克B．胆道出血C．胆源性肝脓肿D．胆囊穿孔
