一细线拴着一小球,小球绕固定点在竖直平面内做圆周运动.设小球运动到最低点时所受细线拉力的大小为厂已知小球所受重力的大小为G,则( )
A <img src="https://www.beizhujiaoyu.com/uploads/202208/20130111153653815381.jpg" alt="" border="0" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/20130111153794099409.jpg" alt="" border="0" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/2013011115370111111.jpg" alt="" border="0" /> D 以上三种情况都可能发生