新生儿出生后4～7天常见的惊厥病因是()

A．高钙血症

B．低镁血症

C．化脓性脑膜炎

D．颅内畸形

E．自身免疫力增强

Assume a company's ROE is 14% and the required return on equity is 13%. All else remaining equal, if there is a decrease in a firm's retention rate, a stock's value as estimated by the constant growth dividend discount model (DDM) will most likely:（）

A. increase.

B. decrease.

C. not change.