当鼠标指针呈现（）形状，表示窗口可以在水平方向进行缩放。
A <img src="https://www.beizhujiaoyu.com/uploads/202208/161232054222311.png" width="12" height="28" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/161232054677661.png" width="27" height="11" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/161232055148871.png" width="22" height="22" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/161232055586611.png" width="18" height="19" />
