基准选择以变速箱箱体的输入轴和输出轴的支承孔作为粗基准，以顶面与两个工艺孔作为精基准。
The reference is chosen tobe the base of the input shaft and the output shaft of the gearbox, and the top and the two technological holes are used as the reference.
基准选择以变速箱箱体的输入轴和输出轴的支承孔作为粗基准，以顶面与两个工艺孔作为精基准。
The reference is chosen tobe the base of the input shaft and the output shaft of the gearbox, and the top and the two technological holes are used as the reference.
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