题干
— We'll have _______ holiday in June. Will you go home?
— No. If I go home, I'll have to take_______ ride.
A：a one-week; seven days
B：an one-week; a seven day's
C：a one-week; a seven-day
D：an one-week's; a seven days'
答案(点此获取答案解析）
C
，y为该点到地面的距离，c为常数，B0为一定值．铝框平面与磁场垂直，直径ab水平，(空气阻力不计)铝框由静止释放下落的过程中( )