外径必须与内径同轴。
A.The external diameter must be concentric to the internal diameter B.The outer radius and the inner radius must be suitable. C.The exterior 'radius must be installed on a common shaft with the interior radius.正确答案A
外径必须与内径同轴。
A.The external diameter must be concentric to the internal diameter B.The outer radius and the inner radius must be suitable. C.The exterior 'radius must be installed on a common shaft with the interior radius.正确答案A
