A:what time would she like to
B:at what time she’d like to
C:when would she like to
D:when she likes to
Who is the man black hair?
质量m=1kg的小球在长为L=1m的细绳作用下在竖直平面内做圆周运动,细绳能承受的最大拉力Tmax=46N,转轴离地高度h=6m,g=10m/s2.试求: