甲同学体重600N,乙同学体重500N,他们进行登楼比赛,甲跑上五楼用30s,乙跑上五楼用24s,则 同学做功较多, 同学的功率较大。
甲 乙
I'm sorry you _____ the wonderful football game. It was just over.[ ]
A. have lost
B. have missed
C. are missing
D. will lose
解释一次采油、二次采油和三次采油方法?