评价机械产品的功能和质量指标中，精度指标一般不包括（）In evaluating the function and quality of mechanical products, which of the accuracy index is generally not included.

A、功率Power;
B、机床的主轴精度Spindle accuracy of machine tool;
C、机床的导轨精度Guide rail accuracy of machine tool;
D、机床的传动链精度Transmission chain accuracy of machine tool