A:x2f(x1)>1
B:x2f(x1)=1
C:x2f(x1)<1
D:x2f(x1)<x1f(x2)
长L=0.5m的轻杆,其一端连接着一个物体A,A的质量m=2kg.现让A在竖直平面内绕O点做圆周运动,如图所示.(g=10m/s2)
—I am going to Hawaii next week .—_____________ .