题干
He succeeded in gaining a gold medal in Beijing Olimpics and all his efforts _____ in the end.
A：made out
B：paid off
C：lit u
D：looked up to
答案(点此获取答案解析）
A
A：made out
B：paid off
C：lit u
D：looked up to
约45km，质量
和半径
（其中
为光速，
为引力常量），则该黑洞表面重力加速度的数量级为