A 2-year-old child is brought to the emergency room with a broken arm. Which of the following findings would lead the nurse to suspect child abuse（）

A. The child has bruises on the forearms.

B. The child’s clothes are dirty, torn, and obviously "hand-me-downs. "

C. The child’s father alters the story of the injury each time he tells it.

D. The child’s mother did not come to the hospital with the child.

冶金铁路运输机车车辆进入厂房时速（）公里。

A、15

B、10

C、5

D、3