—Have you read the book Harry Potter?
—Sure. Eric is also it and we become friends because of that.
A:proud of
B:afraid of
C:serious about
D:interested in
若sinπ3-α=14,则cosπ3+2α=( )
100×16=____
如图所示,m为在水平传送带上被传送的小物块(可视为质点),A为终端皮带轮,已知皮带轮半径为r,传送带与皮带轮间不会打滑。若物块被水平抛出,则A轮每秒的转数至少是()
平时夜晚用肉眼看到最多的天体是( )