When a part is represented, according to the different structure characteristic of it, the orientation of the part can be machined orientation or working orientation. For a shaft, the represention orientation of it is working orientation.
A.
正确
B.
错误
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【单选题】在正常工作条件下,作用水头H、直径d相等时,小孔口的流量Q和圆柱形外管嘴的流量Q n 的关系为