题干
He is going to return home in two days. The underlined part means ________.
A：give back
B：come back
C：write back
D：go to
答案(点此获取答案解析）
B
起动，所受阻力为1.0×103
，则汽车起动后第1秒末牵引力的瞬时功率是 ( )