如图所示,长为L的硬杆A一端固定一个质量为m的小球B,另一端固定在水平转轴O上,硬杆可绕转轴O在竖直平面内缓慢转动.则在硬杆与水平方向的夹角α从90°减小到0°的过程中,下列说法正确的是( )
A:小球B受到的合力方向始终沿杆向上
B:小球B受到硬杆A的作用力逐渐减小
C:小球B受到硬杆A的作用力对小球做负功
D:小球B受到硬杆A的作用力的方向始终沿杆向上
Julia's father, Mr Green is 40 years old. He has two brothers and three sisters. Julia's mother, Mrs. Green is a farmer. She has two brothers and two sisters. Julia has a brother, his name's Ben. Look! Ben is on the sofa. Julia is on the chair. Ben likes sports.He has basketballs and footballs.Julia doesn't like sports, she likes reading books.
请结合所学知识,探究下列问题:
Jeff has a lot of ____ (meat) for lunch every day.