患者男，50岁，已诊断为慢性牙周炎，其治疗方案为首先进行基础治疗

第二阶段的手术治疗指征包括（）.

A.牙龈形态异常

B.牙槽骨形态异常

C.牙周探诊约5mm

D.复杂的牙周袋没有完全消除的

E.以上全部

Which of the following functions would the nurse expect to be unrelated to the placenta()

A. Production of estrogen and progesterone.

B. Detoxification of some drugs and chemicals.

C. Exchange site for food, gases, and waste.

D. Production of maternal antibodies.