一Do you. know_______lady in red?一Yes. She is a teacher of a university.
A:the
B:a
C:an
D:不填
—Yes. I finished it a moment ago.
B: __________ on the bed.
李博亚是一名在昌黎火车站实习的铁路警察,他因从铁轨上救人不幸被轧断了双腿,他说:“我不后悔,如果还有第二次,我还会这样做。”对他的行为以下认识错误的是( )
下列物体中,既有动能又有势能的是( )