X维(X-Dimension)
X维度（也是支点）是前轴中心与前叉后跟之间的距离。该尺寸对于确定叉车的容量是必需的。
英文介绍
The X-Dimension (also the fulcrum point) is the distance between the centre of the front axle and the heel of the fork. This dimension is necessary to determine the capacity of the forklift truck.