The range method accepts a starting index, as well as a step size.
range方法接受起始索引以及步长。
Note that if the step attribute is omitted, the step size defaults to 1.
如果省略了step属性，那么步长缺省为1。
Method accepts a starting index , as well as a step size.
方法接受起始索引以及步长。
Step size and transmitting errors impact the control precision.
步长和误码主要影响控制的精度；
Step size and transmitting errors impact the control precision.
步长和误码主要影响控制的精度；
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